Abstract
A 24-year-old woman was admitted to the hospital because of nausea after a meal. Abdominal CT scan showed a cystic tumor in the left posterior side of the descending colon.
Her abdominal wall was flat and soft ; the tumor was not palpable. A well-demarcated, 50 mm × 32 mm, cystic tumor was detected in the same location as CT on T2-weighted magnetic resonance imaging (MRI). The tumor had no solid component. Under a diagnosis of benign retroperitoneal tumor, laparoscopic resection was performed without rupturing the tumor capsule. The cyst content was filled with mucus, and the cytology was benign.
On biochemical examination, CEA and CA125 levels were high. Pathologically, the tumor was diagnosed as a mucinous cystadenoma that originated from the retroperitoneum. The patient has been well, without evidence of tumor recurrence, for 9 months since surgery.
