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Adenitis
Adenitis
Adenitis
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Adenitis
SpecialtyEndocrinology

Adenitis is a general term for an inflammation of a gland.[1] Often it is used to refer to lymphadenitis which is the inflammation of a lymph node.[citation needed]

Classification

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Lymph node adenitis

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Main article: lymphadenitis

Lymph adenitis or lymph node adenitis is caused by infection in lymph nodes. The infected lymph nodes typically become enlarged, warm and tender. A swelling of lymph nodes due to growth of lymph cells is called lymphadenopathy. Types include:[citation needed]

  • Neck
  • Abdomen
    • Mesenteric adenitis is an inflammation of the mesenteric lymph nodes in the abdomen. It can be caused by the bacterium Yersinia enterocolitica.[2] If it occurs in the right lower quadrant, it can be mistaken for acute appendicitis, often preceded by a sore throat. Clinical manifestations may include fever, right lower quadrant abdominal pain, nausea, and vomiting. Most often occurs in children age 5–14.

Other

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Sebaceous adenitis is an inflammation of the sebaceous glands in the skin. These glands normally produce sebum (skin oil, a lipid-rich secretion) which prevents drying of the skin.[citation needed]

References

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Adenitis

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Adenitis is the of a , particularly nodes (also known as lymphadenitis), characterized by swelling, tenderness, and often enlargement of the affected tissue due to infection or other inflammatory triggers. This condition can occur in various glands throughout the body, including salivary glands () and, less commonly in humans, sebaceous glands, but lymphadenitis represents the most frequent and clinically significant form. The primary causes of adenitis are infectious agents, with bacterial pathogens such as and being common in acute cases, while viruses like adenovirus, , and Epstein-Barr virus often trigger self-limiting episodes. Other etiologies include fungal infections, mycobacterial diseases (e.g., ), or non-infectious factors like autoimmune disorders. Symptoms typically include localized pain, fever, chills, redness over the gland, and enlargement exceeding 1 cm in diameter, which may progress to formation if untreated. Adenitis manifests in several notable types depending on the anatomical location and underlying cause. Cervical adenitis affects nodes and is frequently suppurative, often linked to upper respiratory infections or dental issues in children and adults. Mesenteric adenitis involves abdominal nodes, mimicking with right lower quadrant pain, and is predominantly viral in origin among pediatric patients. , of the salivary glands, commonly arises from bacterial obstruction or , presenting with facial swelling and pain during meals. Tuberculous adenitis, a chronic form, results from and may require prolonged therapy. Diagnosis of adenitis relies on clinical , including of recent infections and for tender, enlarged nodes, supplemented by blood tests (e.g., showing ), imaging ( or CT for deep nodes), and occasionally to rule out or specific pathogens. Treatment varies by : viral cases often resolve with supportive care like rest, hydration, and analgesics, while bacterial adenitis requires antibiotics such as clindamycin or amoxicillin-clavulanate, with for abscesses. In chronic or mycobacterial instances, extended multidrug regimens or surgical excision may be necessary, emphasizing early intervention to prevent complications like chronic suppuration or systemic spread.

Overview

Definition

Adenitis refers to the of a or glandular tissue. The term originates from the Greek roots "aden-" (ἀδήν), meaning , and "-itis," indicating . Although adenitis can apply to various s, its common usage in primarily denotes lymphadenitis, the of one or more nodes, while also encompassing conditions affecting other structures such as sebaceous, salivary, or s. Adenitis must be differentiated from adenopathy, which describes the abnormal enlargement of glands or nodes without requisite inflammatory changes, and from formation, a suppurative involving localized accumulation that may complicate untreated adenitis but represents a distinct pathological stage.

Epidemiology

Adenitis, encompassing of various glands but most commonly referring to lymphadenitis, exhibits varying incidence and prevalence globally, influenced by infectious etiologies. In developed countries, palpable —a frequent precursor or indicator of lymphadenitis—is estimated to occur in 38-45% of children, making it one of the most common clinical findings in pediatric populations. Lymphadenitis itself contributes significantly to pediatric outpatient care, particularly cervical forms, which are often self-limited but prompt evaluation in up to one-third of young children due to associated infections. Prevalence is notably higher in children under 15 years, with mesenteric adenitis—a specific subtype—predominantly affecting those aged 5-14 years and representing up to 20% of cases initially suspected as in pediatric emergency settings. Immunocompromised individuals, including those with or primary immunodeficiencies, face elevated risks, as infections like or more readily progress to severe lymphadenitis in this group. Geographic variations underscore the role of endemic infections; for instance, has a prevalence of approximately 4.4 cases per 1,000 children under 14 in rural , while in and , it accounts for 30-40% of peripheral cases due to higher burdens. In contrast, developed regions like the and report lower rates of such chronic forms, with acute bacterial lymphadenitis driven more by common pathogens like streptococci. Key risk factors include young age (peaking in and school-aged children), compromised immune status, and exposure to specific pathogens such as in temperate climates or in community settings, which amplify incidence through increased susceptibility to infectious triggers.

Pathophysiology

Inflammatory Mechanisms

Adenitis begins with the of an inflammatory cascade when antigens from pathogens or irritants are recognized by resident immune cells within the glandular tissue, such as macrophages and dendritic cells, leading to the activation of the . This recognition prompts the rapid release of pro-inflammatory cytokines, including interleukin-1 (IL-1) and tumor necrosis factor-alpha (TNF-α), which amplify the response by recruiting additional immune effectors and inducing local . These cytokines are primarily secreted by activated macrophages and play a central role in coordinating the inflammatory milieu, as evidenced in glandular inflammations where IL-1 promotes endothelial activation and TNF-α enhances leukocyte adhesion to vascular walls. The recruited immune cells, particularly neutrophils and macrophages, infiltrate the glandular , contributing to the acute phase of through and release of and additional mediators. infiltration is driven by gradients established by initial signaling, resulting in the accumulation of these cells in the and sinuses of affected glands, such as lymph nodes. Macrophages further exacerbate the process by sustaining production and , fostering a feedback loop that intensifies local . In cases of persistent stimulation, this infiltration can lead to tissue remodeling, with of resident cells like lymphocytes and reticuloendothelial elements becoming prominent. As inflammation progresses, cytokine-mediated increases in cause plasma , resulting in that contributes to glandular swelling. , characterized by proliferation of lymphoid or epithelial cells in response to mitogenic signals from cytokines like IL-1, enlarges the gland and may distort its architecture. In severe acute scenarios, unchecked activity can culminate in suppuration, where forms pus-filled abscesses within the gland. Impairment of lymphatic drainage exacerbates glandular engorgement by trapping inflammatory and cells, while vascular changes, including endothelial swelling and , further hinder fluid clearance and intensify tenderness through heightened on surrounding tissues. These mechanisms collectively drive the pathological swelling and dysfunction observed in adenitis, with the balance between resolution and chronicity depending on the efficiency of immune clearance.

Affected Glands

Adenitis most commonly affects lymph nodes, which serve as primary sites for immune filtration and response by trapping pathogens and initiating adaptive immunity through lymphocyte activation. These small, bean-shaped structures, distributed throughout the body, swell in response to infection or inflammation, reflecting their role in filtering lymph fluid and housing immune cells like B and T lymphocytes. Mesenteric lymph nodes, located in the abdominal mesentery, exemplify this by providing immune surveillance for the gastrointestinal tract, often becoming inflamed in conditions like mesenteric adenitis due to nearby infections. Other glands susceptible to adenitis include salivary glands, where involves inflammation of structures responsible for secretion to aid and oral health. The gland, which regulates through production, can develop , leading to glandular inflammation that disrupts endocrine function. Sebaceous glands, which produce sebum to lubricate and protect the skin, rarely experience adenitis in humans, typically manifesting as localized neutrophilic inflammation on the face or . Variations in gland structure influence patterns; encapsulated glands like lymph nodes and major salivary glands tend to exhibit discrete, contained swelling due to their fibrous capsules that limit spread, whereas more diffuse glandular tissues, such as those in the , may show broader infiltrative affecting surrounding . This structural difference can determine the localized versus systemic nature of adenitic responses.

Causes

Infectious Causes

Infectious causes of adenitis, particularly lymphadenitis, are primarily due to microbial that triggers an inflammatory response in nodes, leading to their enlargement and tenderness. These infections can result from direct through breaks, hematogenous dissemination from a primary site, or contiguous spread from adjacent infected tissues. Common pathogens include , viruses, fungi, and parasites, with the specific agents often determined by the patient's immune status, geographic location, and exposure . Bacterial infections are the most frequent cause of acute lymphadenitis, often presenting as localized or regional node involvement. Staphylococcus aureus is a leading pathogen, typically entering via skin or soft tissue infections and causing suppurative adenitis through direct inoculation or contiguous spread; it accounts for a significant portion of cases in both children and adults, with methicillin-resistant strains complicating treatment in community settings. Streptococcus species, particularly Streptococcus pyogenes, commonly cause acute cervical lymphadenitis following pharyngitis or skin infections, where bacterial spread to draining lymph nodes provokes a rapid inflammatory response via toxin-mediated tissue damage and immune activation. Yersinia enterocolitica is associated with mesenteric adenitis, mimicking appendicitis; transmission occurs via ingestion of contaminated food or water, leading to ileal infection and subsequent hematogenous or lymphatic spread to abdominal nodes, resulting in hyperplasia and inflammation. Chronic bacterial adenitis is exemplified by Mycobacterium tuberculosis, causing scrofula or tuberculous lymphadenitis, primarily in the cervical chain; airborne transmission from respiratory droplets initiates primary pulmonary infection, followed by hematogenous dissemination to nodes, where granulomatous inflammation develops due to cell-mediated immune response. Viral infections typically produce reactive, generalized lymphadenitis without suppuration, driven by systemic immune activation. Epstein-Barr virus (EBV), transmitted through saliva, causes with prominent cervical and generalized adenopathy; viral replication in B lymphocytes induces T-cell proliferation and release, enlarging nodes. Cytomegalovirus (CMV), spread via bodily fluids, similarly leads to mononucleosis-like illness with in both immunocompetent and immunocompromised individuals, through endothelial cell infection and subsequent immune hyperplasia. Human immunodeficiency virus (HIV) results in early in infection, transmitted sexually or via blood; it depletes + T cells while initially hyperactivating lymphoid tissue, causing . Fungal and parasitic infections more commonly affect immunocompromised hosts, such as those with or on immunosuppressive therapy, leading to disseminated disease with nodal involvement. Histoplasma capsulatum, acquired by inhalation of spores from soil or bat guano, causes mediastinal and generalized adenitis; in immunocompromised patients, it disseminates hematogenously, forming granulomas in lymph nodes due to infection and poor containment. Toxoplasma gondii, transmitted via undercooked meat or oocysts in contaminated water, induces cervical or generalized lymphadenitis; in immunocompromised individuals, tachyzoite proliferation evades immune control, causing necrotizing inflammation in nodes.

Non-Infectious Causes

Non-infectious causes of adenitis involve sterile inflammatory processes driven by immune dysregulation, , or external triggers, contrasting with the more prevalent pathogen-mediated etiologies. These conditions often present with glandular swelling and tenderness but require differentiation through histopathological or serological evaluation to exclude . Autoimmune disorders represent a primary category of non-infectious adenitis, where aberrant immune responses target glandular tissues. Sjögren's syndrome, a systemic autoimmune condition, frequently manifests as chronic lymphocytic affecting the s, leading to focal lymphocytic infiltration and glandular dysfunction. This infiltration correlates with sicca symptoms and can be confirmed via minor biopsy showing focus scores indicative of the disease. , another autoimmune-mediated process, causes granulomatous lymphadenitis characterized by noncaseating epithelioid granulomas in lymph nodes, often involving cervical or hilar regions without identifiable infectious triggers. The etiology remains idiopathic, though genetic and environmental factors contribute, and it carries a generally favorable in isolated nodal involvement. Neoplastic processes can induce secondary adenitis through direct glandular infiltration or reactive . Lymphomas, including Hodgkin and non-Hodgkin variants, commonly cause with inflammatory features due to tumor within nodes, mimicking infectious adenitis on initial presentation. Metastatic cancers, such as those from head and neck primaries or distant sites like or , similarly provoke nodal via tumor emboli or release, often presenting as firm, fixed masses. Idiopathic or reactive non-infectious adenitis arises from or mechanical insults without underlying or . Drug reactions, exemplified by , trigger pseudolymphomatous with and inflammatory infiltrates, typically resolving upon discontinuation but occasionally mimicking . Trauma to glandular tissues, such as blunt injury to the or oral structures, can result in hemorrhagic or reactive lymphadenitis, with swelling due to formation and secondary inflammation. Rare non-infectious causes include allergic and endocrine influences on glandular function. Allergic reactions, such as iodinated contrast-induced sialadenitis (iodine ), cause acute, painless swelling of salivary glands through accumulation and osmotic effects, usually self-limiting within 24-48 hours. Endocrine disorders, including diabetes mellitus, may contribute to via and reduced salivary flow, predisposing glands to inflammatory stasis without direct microbial involvement.

Clinical Presentation

General Symptoms

Adenitis, or inflammation of a gland such as a lymph node, typically presents with localized signs of over the affected area. These include swelling of the , tenderness to , increased warmth, and of the overlying skin. The swollen s are often painful, particularly during acute episodes, and may exhibit fluctuance if an develops. In acute cases, systemic symptoms frequently accompany the local findings, including fever, , and chills. These manifestations reflect the body's to or and can vary in severity depending on the underlying cause. Affected lymph nodes in adenitis often have a rubbery or firm consistency upon and remain mobile beneath the skin, distinguishing them from fixed or matted nodes seen in other conditions. This mobility typically persists unless adhesions form due to prolonged . Site-specific variations may influence the prominence of certain symptoms, but the core features remain consistent across locations. The temporal pattern of adenitis helps differentiate acute from chronic forms: acute adenitis features sudden onset and resolves within less than 2 weeks, while chronic adenitis persists beyond 4 weeks, often with subtler or recurrent symptoms.

Location-Specific Manifestations

Adenitis manifestations vary significantly depending on the anatomical location of the affected glands, influencing local symptoms and associated discomfort. In the cervical or region, of nodes often leads to pain on swallowing, known as , and jaw stiffness, particularly when submandibular nodes are involved, as these symptoms arise from localized swelling and tenderness compressing nearby structures. This presentation is commonly linked to concurrent upper respiratory infections, such as those causing or , which trigger reactive lymphadenitis. Mesenteric adenitis in the abdominal region typically causes acute right lower quadrant pain that can mimic , accompanied by , , and due to of nodes in the . These symptoms result from the proximity of inflamed nodes to the intestines, leading to irritation and gastrointestinal upset, often in the context of a viral illness. Axillary adenitis, involving nodes in the armpit, may produce changes such as redness and tenderness over the affected area, especially when secondary to nearby infections like those in the breast or upper extremity. Similarly, inguinal adenitis in the region can lead to overlying alterations, including and warmth, typically arising from infections in the lower extremities, anogenital area, or pelvic structures. Salivary gland adenitis, or , frequently manifests with dry mouth, or , due to impaired production from ductal obstruction or , often exacerbated by eating and accompanied by facial swelling or . , a rare condition in humans also known as neutrophilic or vulvar sebaceous adenitis and primarily affecting young women, presents with recurrent tender papules, nodules, or circinate plaques on the or face, sometimes with purulent discharge.

Diagnosis

History and Physical Examination

The evaluation of suspected adenitis begins with a thorough patient history to identify potential underlying factors contributing to glandular inflammation. Clinicians should inquire about recent infections or exposures to ill individuals, as these are common precipitants of reactive adenitis, particularly in cases of bacterial or viral lymphadenitis. history is essential to assess for endemic infections, such as tuberculosis or parasitic diseases, which may manifest as adenitis in travelers from high-risk regions. Immune status, including any history of immunosuppression (e.g., HIV or chemotherapy), must be evaluated, as immunocompromised patients are at higher risk for opportunistic infections leading to adenitis. Additionally, current medications, such as those causing drug-induced hypersensitivity reactions, and family history of autoimmune diseases should be documented to guide differential considerations. Physical examination focuses on systematic palpation and inspection of affected glands to characterize the adenitis. Nodes or glands greater than 1 cm in diameter are generally considered enlarged and warrant further attention, though thresholds vary by location (e.g., supraclavicular nodes >0.5 cm). Tenderness upon suggests an acute inflammatory process, while fixation to underlying tissues indicates possible chronic or invasive . Inspection for overlying skin changes, such as , warmth, or ulceration, helps differentiate infectious from non-infectious causes. A complete exam should include assessment of all nodal basins to determine if the adenitis is localized or generalized. Certain findings during history and physical examination serve as red flags prompting urgent evaluation for serious conditions. Unintentional , persistent adenitis lasting more than 4 weeks, or involvement of supraclavicular nodes are concerning for , such as or metastatic disease. The presence of constitutional symptoms like fever, , or in conjunction with these features further heightens suspicion. Differential diagnosis based on history and examination primarily distinguishes between infectious adenitis (e.g., bacterial or viral), , and reactive . For instance, acute onset with tenderness often points to , whereas hard, fixed nodes without tenderness raise concern for . Reactive may be suggested by a history of recent or minor trauma. These clinical features help prioritize subsequent investigations without relying on confirmatory tests.

Diagnostic Tests

Diagnostic tests for adenitis, particularly lymphadenitis, are essential to confirm , assess severity, and identify underlying etiologies such as or . These tests typically follow initial clinical and are selected based on symptoms like fever or localized swelling to guide targeted investigations. Laboratory studies provide initial systemic insights, while imaging and invasive procedures offer anatomical and microbiological confirmation. Blood tests form the cornerstone of initial laboratory evaluation. A complete blood count (CBC) often reveals leukocytosis, indicating an acute inflammatory or infectious process, particularly in bacterial causes. Elevated erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) serve as non-specific markers of , with CRP being more sensitive for acute changes. Blood cultures are recommended in cases of suspected bacteremia, while serologic testing, such as IgM antibodies for Epstein-Barr virus (EBV), helps identify viral etiologies like . Imaging modalities are crucial for visualizing gland involvement and differentiating adenitis from complications like abscesses or neoplasms. is the preferred first-line imaging due to its non-invasive nature, allowing assessment of node architecture, size, , and via Doppler to distinguish reactive from malignant nodes. For deeper or abdominal glands, computed tomography (CT) or (MRI) provides detailed evaluation, identifying , formation, or extension into surrounding tissues, with CT being particularly useful for mesenteric adenitis. Invasive procedures are employed when non-invasive tests are inconclusive or is suspected. (FNA) enables cytological examination, microbial culture from aspirate, and identification of features like granulomas in tuberculous adenitis. Excisional , considered the gold standard for tissue diagnosis, is performed for persistent or atypical cases to allow comprehensive histological analysis. Specialized tests target specific etiologies. The Mantoux tuberculin skin test (TST) is used to screen for in endemic areas or with compatible clinical features, though it requires confirmation with if positive. on aspirated material aids in evaluating for when nodes show suspicious features like rapid growth or B-symptoms.

Management

Supportive Measures

Supportive measures for adenitis primarily aim to alleviate symptoms and promote natural resolution, particularly in cases of uncomplicated lymphadenitis caused by viral infections or mild bacterial processes. These interventions are non-invasive and can be implemented at home under medical guidance. is a cornerstone of supportive care, with nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen recommended to reduce tenderness, swelling, and associated fever. Over-the-counter options like ibuprofen (Advil, Motrin IB) or naproxen sodium (Aleve) are commonly advised for adults, while acetaminophen (Tylenol) serves as an alternative for pain relief, especially in children to avoid the risks associated with NSAIDs. Aspirin should be avoided in pediatric patients due to the potential for Reye's syndrome. Rest and adequate hydration are essential, particularly for individuals experiencing systemic symptoms such as fever or , and are especially beneficial in children with viral etiologies like mesenteric adenitis. Encouraging sufficient rest allows the body's to target the , while fluid intake prevents exacerbated by fever or reduced appetite. A , such as broths, may further support comfort during acute episodes. Applying warm compresses to the affected area can help reduce localized swelling and provide symptomatic relief for superficial lymph nodes. A warm, moist washcloth applied several times daily for 10-15 minutes is a simple, effective method to improve comfort without promoting further . Outpatient monitoring is crucial to ensure resolution, with follow-up recommended within 2-4 weeks if symptoms persist or worsen, allowing for timely reassessment and adjustment based on -specific needs. Patients should track symptom progression and report any signs of complications, such as increasing node size or systemic illness.

Targeted Treatments

Targeted treatments for adenitis address the underlying to resolve and prevent complications, tailored to whether the condition stems from bacterial, viral, fungal, autoimmune, or malignant causes. For bacterial adenitis, antibiotic is the , selected based on the suspected and local resistance patterns. In cases of staphylococcal or streptococcal lymphadenitis, first-generation cephalosporins such as cephalexin (25-50 mg/kg/day divided every 6-8 hours for 7-10 days) are commonly prescribed for methicillin-sensitive strains, while clindamycin (20-40 mg/kg/day divided every 6-8 hours) serves as a first-line option in regions with high methicillin-resistant Staphylococcus aureus prevalence to cover both aerobic and anaerobic bacteria. For tuberculous adenitis, known as scrofula, a standard six-month anti-tuberculosis regimen is employed, beginning with an intensive phase of isoniazid (5 mg/kg/day, max 300 mg), rifampin (10 mg/kg/day, max 600 mg), pyrazinamide (15-30 mg/kg/day, max 2 g), and ethambutol (15-25 mg/kg/day, max 1 g) for two months, followed by a continuation phase of isoniazid and rifampin for four months, achieving cure rates exceeding 95% in confirmed cases. Viral and fungal etiologies require specific antimicrobials in targeted scenarios. Acyclovir, administered orally at 20 mg/kg/dose (maximum 400 mg/dose) every 8 hours for 5-7 days in children or 400 mg five times daily in adults, or intravenously at 5-10 mg/kg every 8 hours for severe cases, effectively treats virus-associated lymphadenitis by inhibiting viral , leading to rapid resolution of nodal inflammation and associated symptoms within days. In immunocompromised patients with fungal adenitis, such as disseminated or involving lymph nodes, liposomal (3-5 mg/kg/day intravenously) is the preferred initial therapy due to its broad-spectrum activity against invasive fungi, often continued until clinical improvement before transitioning to oral azoles like . Surgical interventions provide definitive management for suppurative or persistent cases unresponsive to medical therapy. , guided by when possible, is indicated for formation in acute bacterial adenitis to evacuate and facilitate penetration, with studies showing reduced recurrence rates compared to aspiration alone in pediatric suppurative cervical lymphadenitis. For chronic adenitis, such as nontuberculous mycobacterial infections, complete surgical excision of affected nodes may be necessary to eradicate residual disease, particularly if medical therapy fails. In neoplastic adenitis, like , surgical confirms diagnosis, but excision is reserved for localized disease or complications, with broader resection avoided in favor of . Immunomodulatory and antineoplastic agents target autoimmune or malignancy-driven adenitis. Corticosteroids, such as (0.5-1 mg/kg/day tapered over weeks), are used for autoimmune in conditions like Sjögren's syndrome to suppress glandular inflammation during acute flares, though long-term use is limited due to side effects and reserved for severe extraglandular involvement. For malignancy-associated adenitis, such as , chemotherapy regimens like R-CHOP (rituximab, , , , and ) administered in 21-day cycles form the mainstay, achieving complete remission in over 70% of cases with nodal presentation. These targeted approaches may complement supportive measures like analgesics for symptom control.

Classification

By Location

Adenitis encompasses inflammation of various glands or lymph nodes, and its classification by anatomical location helps guide clinical evaluation and , as the site often correlates with specific infectious or inflammatory triggers and symptom patterns. Among adenitis (lymphadenitis), the cervical region in the is the most prevalent site, particularly in pediatric populations where it accounts for over 90% of presentations in children aged 4 to 8 years, often linked to upper respiratory infections. In broader cohorts including adults, cervical involvement remains dominant, comprising approximately 57% of cases. Axillary adenitis, affecting lymph nodes in the armpit, is less common and typically arises from infections or injuries in the upper extremities. Inguinal adenitis involves groin nodes and is associated with lower extremity or genitourinary infections. Mesenteric adenitis targets abdominal lymph nodes and is notable for its occurrence in children, where it frequently presents with right lower quadrant pain. Non-lymphatic forms of adenitis affect specialized glands. refers to inflammation of the salivary glands, most commonly the parotid or submandibular, often due to bacterial ascent from the oral cavity or ductal obstruction. involves the thyroid gland in the neck and encompasses various subtypes, including acute suppurative and autoimmune forms like , leading to glandular swelling and potential hormonal disruption. , a rare inflammatory condition targeting sebaceous (oil-producing) skin glands, primarily manifests as neutrophilic or vulvar variants in humans, resulting in localized plaques or nodules. The location of adenitis significantly influences diagnostic considerations; for instance, mesenteric adenitis commonly mimics acute , prompting to differentiate it from surgical emergencies. Similarly, cervical or axillary sites may suggest regional infections, while glandular adenitis like requires evaluation for obstructive calculi. This spatial classification underscores the importance of anatomical context in narrowing etiologic possibilities without overlapping with causal factors.

By Etiology

Adenitis, or lymphadenitis, is classified by into infectious and non-infectious categories, with further distinctions based on the causative agent or underlying mechanism. Infectious etiologies predominate in acute presentations and involve direct microbial invasion or to pathogens, while non-infectious causes often reflect systemic immune dysregulation or malignancy-related processes. Infectious adenitis encompasses bacterial, viral, and mycobacterial subtypes. Bacterial adenitis typically manifests as acute suppurative , characterized by formation and rapid nodal enlargement due to pathogens such as or , which trigger neutrophilic infiltration and development. Viral adenitis is generally reactive, involving without suppuration, often secondary to viruses like Epstein-Barr virus or , which provoke B-cell proliferation and follicular expansion as part of the host . Mycobacterial adenitis, such as that caused by or atypical mycobacteria, presents as granulomatous with caseating necrosis, reflecting a cell-mediated immune reaction that forms epithelioid histiocytes and multinucleated giant cells. Non-infectious adenitis includes autoimmune, neoplastic, and idiopathic forms. Autoimmune adenitis arises from dysregulated immune responses, as seen in , where infiltration of IgG4-positive plasma cells leads to fibroinflammatory changes and nodal enlargement through storiform and obliterative . Neoplastic adenitis may occur as paraneoplastic phenomena, in which an underlying malignancy induces reactive via release or autoimmune , distinct from direct tumor infiltration. Idiopathic adenitis lacks a identifiable cause and includes entities like Kikuchi-Fujimoto disease, marked by histiocytic necrotizing lymphadenitis without neutrophils. Adenitis is further delineated as acute or chronic based on duration and clinical response. Acute adenitis is defined by onset and persistence less than 2 weeks, often resolving with treatment of the underlying trigger, whereas chronic adenitis endures beyond 4 weeks, potentially indicating persistent , , or autoimmune processes with incomplete resolution. Overlaps between etiologies occur, particularly in post-infectious autoimmune adenitis, where an initial microbial insult, such as a viral , triggers subsequent autoimmune-mediated nodal , as in cases evolving into conditions like . Location may influence suspicion of specific etiologies, guiding initial diagnostic considerations.

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