Abstract
A 64-year-old man, who had undergone hemodialysis for 11 years, presented with left abdominal pain. Computed tomography showed a 10cm hematoma located in the left retroperitoneal space, and that multiple cysts and leakage of radiocontrast agent were noted in the hematoma. He was diagnosed as having a retroperitoneal hemorrhage from the left kidney, and spontaneous rupture of the renal cyst was suspected. Securing the visceral hemostasis was required to allow hemodialysis to continue, so emergency surgery was planned. The patient underwent nephrectomy through a median incision, and first the left renal vessels were ligated before manipulation of the kidney. The resected specimen revealed hemorrhage in the renal cysts, one of which had ruptured. Rupture of the renal cysts due to spontaneous hemorrhage is very rare. We report herein on the present patient with some review of the literature.