Contains fat, hair, teeth, skin

• A. Cystic teratoma, dermoid
• B. Fibroma
• C. Dysgerminoma
• D. Choriocarcinoma

Answer: (A)

A lesion that contains fat, hair, and sometimes teeth is classic for a teratoma, specifically a mature cystic teratoma (dermoid cyst). Teratomas arise from multiple germ layers and can include a variety of differentiated tissues, with fat from adipose tissue, hair from ectoderm, and even teeth or bone from mesoderm derivatives. In the ovary, this form typically appears as a cystic mass that may have intracystic echogenic material (fat) and sometimes calcifications representing teeth, often described as a Rokitansky protuberance. This combination of tissue types is distinctive and helps differentiate it from other ovarian tumors. Fibroma tends to be solid and fibrous, dysgerminoma is usually a solid germ cell tumor without containing hair or teeth, and choriocarcinoma is a malignant trophoblastic tumor; none of those characteristically contain fat, hair, and teeth.