Sudden onset presentation of giant primary thyroid hemangioma: a rare case report.

Hemangiomas are considered slow growing benign neoplasms. Primary thyroid hemangiomas are uncommon and may pose difficulty in diagnosis due to absence of distinctive imaging characteristics and related clinical symptoms. It is crucial to precisely identify these lesions to aid in implementing nonsurgical treatment plans rather than resorting to surgical procedures in certain cases. In this report we present a case of a 76-year-old female who presented with painless, rapid, and sudden notice of right-side neck swelling over a 1-day duration. Her radiological examinations raised the concern of a vascular lesion that was emoblized endovascularly. Then, it was surgically removed, which was eventually determined to be primary thyroid hemangioma. In addition, we present a literature review of previously published cases and discuss tumor pathophysiology, clinical presentations, radiology features, and differential diagnosis.