Gil, RuiCunha, Teresa MargaridaRolim, Inês2017-11-032017-11-032017-07Rui Gil; Teresa Margarida Cunha; Inês Rolim. Mature cystic teratoma with high proportion of solid thyroid tissue: a controversial case with unusual imaging findings, Journal of Radiology Case Reports, 11, 7, 20-30, 2017.1943-0922http://hdl.handle.net/10400.26/19170We describe a case of a mature cystic teratoma of the ovary with high proportion of solid thyroid tissue (< 50% of the entire tumor) in a childbearing woman. The patient presented with non-specific abdominal bloating. Pelvic ultrasound and magnetic resonance imaging revealed a complex cystic-solid tumor confined to the left ovary with an anterior fatcontaining locus compatible with mature cystic teratoma and a posterior predominantly solid component with low signal intensity on T2-weighted images that was histopatologically diagnosed as benign thyroid tissue. Thyroglobulin levels were in normal range. Although thyroid tissue is present in up to 20% of mature cystic teratomas, with exception of struma ovarii, it is not usually macroscopically nor radiologically identified. The differential diagnosis should include T2-hypointense adnexal lesions associated with mature cystic teratoma, malignant transformation of mature teratoma, and immature teratoma.engjournal article2017-08-0510.3941/jrcr.v11i7.2853