Idiopathic Chronic Expanding Hematoma in Retroperitoneal Space—A Case Report—

Abstract

A 58-year-old male patient visited our hospital with a chief complaint of right-sided lower abdominal pain. An abdominal CT scan revealed a 12 cm cystic mass in the pelvis, which did not intrude on the right ureter and common iliac artery and vein. We could not deny the possibility that it was a retroperitoneal malignant tumor that it was a retroperitoneal malignant tumor, so we performed a resection of the cystic mass. During the operation, we damaged the cyst wall and a considerable amount of brown colored fluid appeared from within the mass. The cyst wall was then completely resected. Pathological results indicated that the mass was a previously undiagnosed hematoma that had become encapsulated ; therefore, we diagnosed it as an idiopathic chronic expanding hematoma (CEH) in the retroperitoneal space. Here, we report a very rare case of retroperitoneal CEH with a review of the literature.