Struma ovarii and Brenner tumor

One struma ovarii with agregates of epithelial nests indistinguishable from Brenner tumor was studied. The presence of a communication between the nests and the follicles and the association of Brenner, mucinous and respiratory epithelium in the lining of 1 cyst in the same tumor strongly support the germ theory of Brenner tumors associated with teratomatous elements.