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Ultrasound and CT demonstration of a benign cystic teratoma arising from the retroperitoneum.

The value of both ultrasound and computed tomography (CT) in the diagnosis of intraabdominal and retroperitoneal tumors has been well established. Retroperitoneal teratomas are rare [1 ]. The following case illustrates the potential for using ultrasound and CT to distinguish teratomas from other tumor types. On the basis of the complex tissue composition of a large abdominal mass, and its extent and effect on adjacent structures, an accurate diagnosis of cystic teratoma was made.