title: Malignant haemangiopericytoma presenting as an insulinoma.
mesh_terms: D007516:Adenoma, Islet Cell / Q000175:diagnosis*; D000328:Adult; D001706:Biopsy; D003937:Diagnosis, Differential; D006393:Hemangiopericytoma / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D007003:Hypoglycemia / Q000209:etiology; D007340:Insulinoma / Q000175:diagnosis*; D008297:Male; D010190:Pancreatic Neoplasms / Q000175:diagnosis*; D012186:Retroperitoneal Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000473:pathology