A Case of Melanoacanthoma.
- Author:
Jong Min KIM
;
Jae Sun KIM
;
Myung Hun CHA
;
Chong Ju LEE
;
Kye Yong SONG
- Publication Type:Original Article
- MeSH:
Buttocks;
Epidermis;
Female;
Humans;
Keratinocytes;
Melanins;
Melanocytes;
Middle Aged;
Papilloma;
Parakeratosis
- From:Korean Journal of Dermatology
1984;22(4):435-438
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Melanoacanthoma is an extremely rare pigmented benign mixed epithelial tumor of both melanocytes and keratinocytes. A 52-year-old female presented an asymptomatic, slightly elevated, 1. 2 cm x 0. 8 cm, dark black-colored plaque on her right buttock of 2 years' duration. Histopathologic finding of the plaque shows hyperkeratosis, focal parakeratosis, follicular plugging, acanthosih, papillomatosis and pseudo-horn cyst in the epidermis. The tumor is composed of basaloid and squarnous cells with many foci of clusters and whorls of melanin pigment-laden cells. Electron microscopic finding reveals many scattered melanocytes in the entire epidermis. Melanin granules are found mostly in the melanocytes but can also be found in a few keratinocytes.
