Haemangiopericytoma (HPC) is an uncommon mesenchymal neoplasm of kidney. It affects young males unlike other common renal tumors and presents with a painless renal mass occasionally associated with haematuria. A 41 year old male presented with a left side 15x15 cm abdominal mass in his left lumbar and hypochondrium region. Contrast enhanced computed tomography showed a heterogenous mass with calcification, fluid filled cystic areas and showing a mild enhancement peripherally. Patient underwent left radical nephrectomy. The tumor was well circumscribed with solid and cystic areas had caused a superior polar hydronephrosis. The histological, histochemical and immuhistochemical findings suggested the diagnosis of HPC. Patient recovered well and is asymptomatic one year after surgery. Introduction Hemangiopericytoma (HPC) is an unusual soft tissue vascular tumor featuring uncontrolled proliferation of pericytes, which are the cells spiraling around capillaries described by Zimmerman[1] Though HPC may occur in any part of body; it predominantly occurs in the lower extremity and retroperitonium[2] and very rarely involves urogenital system[1]. We descried a case of renal HPC in a 41 year old man and present a brief review of literature. Case report A 50 year old male presented with a left side abdominal mass for 3 months. He had no history of haematuria or any other constitutional symptoms. On examination a large 15x15 cm bosselated mass occupying left lumbar and hypochondrium regions was found. Contrast enhanced computed tomography showed a sharply defined heterogeneous mass of size 13x9x20cms with cystic component, calcification and necrosis which had a mild enhancement at periphery, in the left renal area (Figure 1).
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