Indian Journal of Dermatology
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Year : 2011  |  Volume : 56  |  Issue : 1  |  Page : 79-81

Giant melanoacanthoma mimicking malignant melanoma

Department of Dermatology, Venerology, Leprology, M.G.M. Medical College and L.S.K. Hospital, Kishanganj, Bihar, India

Correspondence Address:
Vikas Shankar
Shankar Jee Niwas, Makhania Kuan Road, Patna 800 004, Bihar
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0019-5154.77559

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Melanoacanthoma denotes a rare variant of pigmented seborrheic keratosis. A 65-year-old male farmer had pigmented, verrucous, itchy, highly painful, progressively growing irregularly oval plaque on left side of lower back for the past five years. The indurated lesion, measuring maximum diameter 10 cm Χ 5 cm, had no discharge, bleeding, ulceration, or associated lymphadenopathy. Dermoscopy showed regular pigmentary network and cribiform pattern of ridges without any feature of malignant melanoma. Histopathology showed well-defined islands of basaloid cells interspersed with large and richly dendritic melanocytes. The lesion was totally excised followed by skin grafting. Our patient was unique in its massive size and clinical resemblance with malignant melanoma. The diagnosis was confirmed by dermoscopy and skin biopsy.

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