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Figure 2c.   Mature cystic teratoma in a 20-year-old woman. (a) Sagittal US image demonstrates a mostly echogenic mass (arrows) with some sound attenuation. (b) On an axial contrast material-enhanced CT scan, the cyst cavity demonstrates fat attenuation (F). A round Rokitansky nodule is seen (arrow) and has a feathery appearance at the fatty interface where the hair arises from it (arrowhead). (c) Photograph of the bisected tumor shows the two components of the fat attenuation seen in b: the Rokitansky nodule (thick arrow), which has the yellowish appearance of adipose tissue, and sebaceous components (F). Teeth are seen in the center of the Rokitansky nodule and account for the calcification seen in b. The bulk of the cyst cavity is filled with hair (arrowheads). Note how the cyst wall is folded back (thin arrow).