1. Presented by Peter Illei, M.D. and prepared by Danielle Wehle, M.D.

The patient is a 49 years old Caucasian woman who a year ago was in a motor vehicle accident and suffered blunt abdominal injury. Currently she presented with abdominal pain which she noticed after working in the garden. CT scan of the abdomen showed a 16.0 cm retroperitoneal mass on the right. Resection of the mass and the ascending colon revealed a 16 cm cystic mass filled dark fluid that was adherent to the adventitia/muscularis propria of the colon.

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