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A case of lipomatous pleomorphic adenoma in the ceruminous gland is reported. A 69-year-old Japanese woman presented with a mass in the posterior wall of the cartilaginous external auditory canal. Light microscopic examination revealed a well-circumscribed tumor composed of tubular structures with apocrine secretion and ceroid deposition, extensive mature adipocytes, and spindle-shaped myoepithelial cells in the myxoid and fibrous stroma. This case demonstrates the peculiar location of a lipomatous pleomorphic adenoma in the external auditory canal.

A mixed tumor with apocrine differentiation seen in the external auditory canal of a 39 year old male is reported. The well demarcated polypoid tumor showed proliferation of elongated gland-like or duct-like structures lined by two rows of epithelial cells, occasionally accompanied by foci of keratinization. There were fat cells in the myxoid stroma, in which no chondroid elements were seen. This neoplasm is considered to have arisen from the ceruminous gland, the modified apocrine gland of the skin.