MUCINOUS METAPLASIA OF APOCRINE DUCT

Mucinous syringometaplasia is a rare condition characterized by the pr esence of mucinous cells lining eccrine ducts. Because most occurrence s are on the palms and soles, the disorder is generally considered to be the result of chronic trauma or pressure. We describe an example of mucinous metaplasia involving an apocrine duct on the left arm of a 5 7-year-old woman. Histopathologic study demonstrated that in deeper ar eas of the invagination, the lining of the lumen consisted of columnar cells showing decapitation secretion and that the invagination was co nnected to a rudimentary hair follicle. These histopathologic features support the possibility that the involved duct was an apocrine one. W e discuss the differential diagnosis with those cutaneous adnexal neop lasms in which the presence of mucinous cells has been described.