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ABSTRACT
Hemangiopericytoma is a rare soft tissue tumor that may arise in many body sites. It is primarily a tumor of adult life and occurs in both sexes with equal frequency. We report a case of thyroid hemangiopericytoma in a 58-year-old woman who presented with goiter known for 30 years. The tumor, 7x6 cm. in dimensions was located in the right lobe. Fine Needle Aspiration Biopsy (FNAB) with thyroid ultrasonography failed to be diagnostic and an open biopsy was made from the mass. Microscopic examination revealed malignant hemangiopericytoma. The case was accepted as inoperable. We present an uncommon tumor involving the thyroid with its clinical and histopathological properties in the light of the current literature.