Hypervascularity is an increased number or concentration of blood vessels.

In Graves disease, the thyroid gland is hypervascular, which can help in differentiating the condition from thyroiditis.^[1]

90% of thyroid papillary carcinoma cases are hypervascular.^[2]

1. ^ Current Medical Diagnosis & Treatment 2019. McGraw-Hill. pp. ch26.
2. ^ Diagnostic Ultrasound (5 ed.). Elsevier. 2018. pp. 691–731.

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