tubal adenomatoid tumor

Definition: Adenomatoid tumor is a benign, relatively rare neoplasm occurring primarily in the genital tract of both genders.

Adenomatoid tumours most commonly arise in the genital tract, but occasionally occur in the pleura. They are small and solitary and usually discovered as incidental findings.

Histologically, they are composed of vacuolated epithelioid mesothelial cells forming tubular spaces.

Adenomatoid tumor has groups of cystic spaces with flattened cells. It is a benign tumor of mesothelial origin, and stains positive for mesothelial markers by IHC. It is the most common benign tumor of the fallopian tube.