Malignant Hemangiopericytoma: A Case Report

Hemangiopericytoma is a rare vascular tumor which may occur anywhere in the body. We report such a pathologically-proved case of retroperitoneal hemangiopericytoma in a 34-year-old woman. Radiographs and excretory urography revealed a right abdominal mass with calcification. CT and sonography showed a large, well- defined right retroperitoneal tumor with multicystic components and speckled calcification. Angiography revealed hypervascularity with blood supplied by right lumbar arteries and dilated branches of the right renal artery. A retroperitoneal tumor with multicystic components, speckled calcification and bypervascularity should suggest the diagnosis of hemangiopericytoma.