Localization
adenomatoid tumor of the epididymis
adenomatoid tumor of the tunica albuginea
adenomatoid tumor of the testicle
adenomatoid tumor of the ovary
adenomatoid tumor of the myometrium
adenomatoid tumor of the fallopian tube
adenomatoid tumor of the parafallopian region
adenomatoid tumor of the mediastinum (14707875)
adenomatoid tumor of the adrenal gland (14506647)
Synopsis
cystic spaces lined by flattened or cuboidal epithelial cells
walls of the cysts: proliferation of small canalicular structures lined by round to polygonal epithelioid cells with vacuolated eosinophilic cytoplasm
+/- infarction (14707867)
fibrous tissue
numerous slit-like and pseudotubular spaces
thread-like bridging strands crossing the pseudotubular spaces (14571427)
Immunohistochemistry
AE1/AE3 cytokeratin+
CK5/CK6 cytokeratin+
calretinin+
CK7-
CK20-
alpha-fetoprotein-
CD31-
carcinoembryonic antigen-
MOC-31-
chromogranin-
Electron microscopy
numerous long microvilli on the cell surface and abundant tonofilaments/desmosomal plaques in the tumor cells, characteristic of mesothelial cells