Idiopathic benign retroperitoneal cyst : uncommon retroperitoneal mass

الملخص EN

Retroperitoneal cysts are uncommon, with an estimated incidence of 1 / 5750 to 1 / 250.000.

We found a case of a 54th years old female in Al-Karama Teaching Hospital with sensation of mild left lower abdominal pain colicky in nature with mild backache, ten days duration.

No dysuria, normal bowel motion.

On physical examination we palpated a fixed mass in the left lateral side of abdomen, ultrasound, and CT-scan were done, first we thought it is probably a mesenteric cyst but this cyst was fixed not mobile in nature.

During the operation we found a retroperitoneal cyst at the lateral side of sigmoid colon and extend posterior to the descending colon.

The cyst arising within the retro peritoneum outside the major organs.

CT scan, and MRI might help in investigation of a retroperitoneal cyst, but surgery is the keystone in confirming the diagnosis, and surgery remains the best treatment option.