Ceruminous cystomatosis (ie, ceruminous adenoma, apocrine cystadenomatosis) is an uncommon, nonneoplastic disorder of cats. Lesions most commonly affect the concave pinna, external auditory canal opening, and occasionally the auditory canal. To date, it is thought to represent a congenital or degenerative and senile change. The condition affects cats of all ages, but cysts are more commonly encountered with middle-aged to older cats. A breed predisposition for Abyssinian and Persian cats has been reported, along with a slight predominance in males.1
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