CT of benign cystic teratomas.

The computed tomographic (CT) findings in nine benign cystic teratomas are presented and compared with radiographic, sonographic, and pathologic data. CT rendered a specific diagnosis in six cases and was highly suggestive in two, with results superior to other imaging methods. In each instance, CT was successful in predicting or excluding invasion of adjacent structures, but was not reliable in predicting or excluding adherence to them. Specific CT characteristics of benign cystic teratomas are predominantly fatty mass with a denser dependent element and globular calcification, bone, or teeth in a solid protuberance into the cyst cavity. Suggestive patterns include fatty mass with rim calcification and water density mass with globular calcification and solid tissue elements. Illustrated for the first time are the CT appearances of the different calcifications seen in benign cystic teratomas.