A huge lobular retroperitoneal cystic mass lesion is seen in the right lumbar region, it shows no contrast enhancement and has imperceptible wall. It extends superiorly to the hepato-renal pouch and inferiorly to the right broad ligament, right mesorectal fat planes and presacral space. This mass lesion is displacing the right ureter laterally, the rectum to the left side and the small bowel loops and pancreas anteromedially and it is seen encasing the ureter and renal vessels.