Korean J Dermatol.
2007 Apr;45(4):369-372.
A Case of Melanoacanthoma on the External Auditory Canal
- Affiliations
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- 1Department of Dermatology, Gyeongsang National University, Gyeongsang Institute of Health Science, Jinju, Korea. deroh@nongae.gsnu.ac.kr
- 2Department of Otolaryngology, Gyeongsang National University, Gyeongsang Institute of Health Science, Jinju, Korea.
- 3Department of School of Medicine, Gyeongsang National University, Gyeongsang Institute of Health Science, Jinju, Korea.
Abstract
- Melanoacanthoma, a rare benign variant of seborrheic keratosis, was first introduced by Mishima and Pinkus in 1960. It is a slow-growing, painless, pigmented plaque with a verrucous surface and a diameter ranging from a few millimeters to 10 cm. It tends to develop during middle-age with an equal sex incidence, and the lesion usually presents on the head, trunk, and especially the lip. It also has a histopathologic finding of mixed neoplasm composed of melanocytes scattered throughout keratinocytic lobules, and is characterized by hyperkeratosis, parakeratosis, acanthosis, papillomatosis and pseudo-horn cysts in the epidermis. We report a case of melanoacanthoma occurring in a 52-year-old female, who presented with an easily bleeding mass on her right external auditory canal, an extremely uncommon site.
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