A Retroperitoneal Pseudocyst Caused by Blunt Abdominal Trauma

Abstract

A 59-year-old man presented with a chief complaint of right lower abdominal pain and a mass. Two weeks previously, the patient sustained blunt abdominal trauma and noticed post-traumatic hematuria. Abdominal US and CT showed an 18-cm cystic lesion in the right lower peritoneum compressing and kinking the right ureter. Right hydronephrosis was also present. The history and preoperative examination suggested a post-traumatic pseudocyst, and together with the right hydronephrosis, improvement with conservative management was considered unlikely. Therefore, total laparoscopic resection of the pseudocyst was performed. Histopathology showed a pseudocyst without any epithelial elements. No abnormalities other than the blunt abdominal injury were found. The history, preoperative examination, intraoperative findings, and histopathology were all consistent with a final diagnosis of a post-traumatic retroperitoneal pseudocyst. Retroperitoneal pseudocysts due to trauma have rarely been reported. This rare case is reported along with a discussion of the relevant literature.