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DIFFERENTIAL DIAGNOSIS
Mixed tumor (presence of myxochondroid areas, singificant immunoreactivity for GFAP)
Adenoid cystic carcinoma (cribriform appearance, eosinophilic basal lamina, basaloid cells with anuglar nuclei and clear cytoplasm, perineural invasion)
Basal cell adenocarcinoma (infiltration of parenchyma, invasion of bone, muscle, nerve, skin, fat, mitotic rate of >3/10 HPF)
Dermal eccrine tumors (cylindroma; occurs in skin)
Canalicular adenoma (occurs in upper lip, low columnar cells forming anastomosing cords and lining cystic spaces)
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Slide 52
