Ovarian Dermoid picture -CT, MRI, Mammography, and Ultrasound for Women's Health
Clinical History: Middle-age female with fatty pelvic mass identified on previous CT.
Diagnosis: Ovarian dermoid.
Discussion: Ovarian dermoids (or mature cystic teratomas) are benign lesions composed of mature epithelial elements such as skin, hair, desquamated epithelium, and teeth. Although these masses do not contain fat, they do contain sebum which, being a lipid material, demonstrates signal characteristics identical to fat. Almost all ovarian dermoids contain this lipid material which allows it to be confidently differentiated from other adnexal masses with MR imaging. Specifically, fat saturation techniques can be utilized to unequivocally demonstrate the dermoids predominant lipid component. With ultrasound, these lesions most often are characteristic by a smooth-walled, unilocular cystic structure with a strongly echogenic internal pattern due to the high lipid content. A fat-fluid layer is occasionally seen. Although the majority of ovarian dermoids are asymptomatic, they may present with ovarian torsion.