A case of endometrioid carcinoma of the fallopian tube mimicking an adnexal tumor of probable Wolffian origin - Usefulness of immunohistochemistry inthe differential diagnosis

We report a very uncommon case of endometrioid adenocarcinoma of the fallop ian tube that mimicked, based on histology, a female adnexal tumor of proba ble Wolffian origin (FATPWO). We present our microscopic and immunohistoche mical findings, and a review of the literature concerning these two entitie s. The differential diagnosis can be of great consequence, owing to the ver y different prognoses of the two tumors, and is based mainly on macroscopic appearance and immunohistochemical profile: epithelial membrane antigen (E MA) and CA125, generally lacking in FATPWO, are expressed in endometrioid a denocarcinoma, thus indicating the mullerian origin of this tumor.