Microcystic adnexal carcinoma (MAC) is a rare malignant skin appendageal tumor first described as a specific entity in 1982. It predominantly affects the head and neck, particularly in the centrofacial region. MAC can have a benign appearance
under
the
light microscope. Despite this bland histologic appearance, MAC can be locally aggressive with permeation of perineural spaces, perichondriums, skeletal muscles and so on. Therefore, this tumor is characterized by high morbidity and frequent
recurrence
in spite of aggressive treatment such as wide local excision, Mohs' microscopic surgery, or radiation therapy. Close observation for a long term is therefore mandatory even after a satisfactory excision with a wide resection margin. Recently, the
authors have experienced a case of MAC in the external auditory canal which was treated by wide local excision and skin graft.
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