Imaging findings suggestive of benign-looking retroperitoneal teratoma which is confirmed by histopathological study. No enhancing soft tissue components to suggest liposarcoma.

Retroperitoneal teratoma is slowly growing tumor of germ cell origin. It is usually diagnosed by characteristic imaging findings of a complex mass containing a well-circumscribed fluid component of variable volume, fatty tissue and calcification in either a congealed or dentiform pattern. Histopathology is required to exclude any malignant cells.

In our case, most of patient's symptoms are related to its pressure effect of mass on nearby structure.