Dias, GCaeiro, FCosta, TPedro, APereira, JS2016-03-222016-03-222015Acta Obstet Ginecol Port 2015;9(4):302-3041646-5830http://hdl.handle.net/10400.10/1581Malignant transformation of a teratoma occurs in 1-2% of cases, with carcinoma of the thyroid being extremely rare. It is usually diagnosed in the postoperative histopathological exam. We describe a case of thyroid carcinoma in a mature cystic teratoma.porTeratomaCarcinomaNeoplasias da tiróideNeoplasias do ovárioA case of follicular variant of papillary thyroid carcinoma in a mature cystic teratoma in a young womanUm caso de variante folicular do carcinoma papilar da tiróide num teratoma quístico maduro numa mulher jovemjournal article