1, To illustrate variations of imaging findings of ovarian teratomas. 2, To review usual and unusual presentations of ovarian teratomas with a brief discussion of clinical significance.

Ovarian teratoma is the most common germ cell tumor and the most frequently excised ovarian tumor. Its presentations vary widely from incidental to emergency, moreover, unusual systemic manifestations may occur.

Overview of Ovarian Teratomas Ovarian teratoma accounts for 10–20% of all ovarian neoplasms. Additionally, approximately 50% of pediatric ovarian tumors are teratomas. Ovarian teratomas can also be found coexisting with mucinous tumors1. If a mucinous border-line tumor of intestinal type associates withan ovarian teratoma, it may cause pseudomyxoma peritonei of nonappendiceal origin2. Several local complications of ovarian teratoma are known. Torsion is the most common complication (approximately 3-16% of all ovarian teratoma cases), though rupture (1–4%), malignant transformation (1–2%), and infection (1­2%) may also occur1....

There are many ovarian cystic teratomas, with many possible presentations. Familiarity with the various imaging findings, complications, and manifestations of ovarian cystic teratomas is crucial for their accurate diagnosis and appropriate management.

Comerci Jr, et al. "Mature cystic teratoma: a clinicopathologic evaluation of 517 cases and review of the literature." Obstetrics & Gynecology 84.1 (1994): 22-28. Fujii K, et al. "Ovarian mucinous tumors arising from mature cystic teratomas—a molecular genetic approach for understanding the cellular origin." Human pathology 45.4 (2014): 717-724. Scully R, et al. The 3rd AFIP : Tumors of the ovary, maldeveloped gonads, fallopian tube, and broad ligament. Kim I, et al. "A case of autoimmune hemolytic anemia associated with an ovarian teratoma." Journal of...