Cutaneous horn malignant melanoma

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Haruto Nishida *
Tsutomu Daa
Kenji Kashima
Motoki Arakane
Hiromitsu Shimada
Mizuki Goto
Yoshitaka Kai
Yutaka Hatano
Osamu Okamoto
Shigeo Yokoyama
(*) Corresponding Author:
Haruto Nishida | nharuto@oita-u.ac.jp

Abstract

A 73-year-old Japanese woman presented with cutaneous horn on the right cheek. The resected tumor was 9 mm in diameter, with 14 mm protrusion, and showed exophytic growth with marked papillomatosis. Histopathology showed proliferation of atypical melanocytes with melanin pigments in the epidermis and dermis under the cutaneous horn. These cells were confined to the base of the cutaneous horn, and did not spread to the surrounding epidermis. The final diagnosis was cutaneous horn malignant melanoma. This pathological entity is considered a specific form of verrucous melanoma, and might be added to the list of cutaneous horn-forming lesions.

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Author Biography

Haruto Nishida, Department of Diagnostic Pathology, Faculty of Medicine, Oita University, Yufu