Hemangiopericytoma. A rare vascular tumor with complicated operative and postoperative course

: Haemangiopericytoma (HPC) is a rare soft-tissue vascular neoplasm that may arise in almost all parts of the body. This report describes a 62-year-old man with one of the largest retroperitoneal HPC ever described weighing 950 grams. The surgical excision was followed by severe haemorrhages demanding several operations. The postoperative course was very complicated and prolonged. The geriatric rehabilitation was successful.