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J Dermatol. 2010 May;37(5):484-7. doi: 10.1111/j.1346-8138.2010.00863.x.

Double cancer of plantar malignant melanoma and vulvar extramammary Paget's disease.

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1
Department of Dermatology, Kyoto Prefectural University of Medicine Graduate School of Medical Science, Kamigyo-ku, Kyoto, Japan. takka@koto.kpu-m.ac.jp

Abstract

A 75-year-old woman presented with a 2-year history of a pigmented nodular lesion on her left sole and a 9-year history of a red infiltrative plaque on the vulva. The plantar lesion was a 15-mm ulcerated nodule located at the center of a 25-mm atypical pigmentation region; the nodule was clinically suspected to be a malignant melanoma. Histopathological analysis of the vulvar lesion biopsy sample indicated extramammary Paget's disease (EMPD). There was no evidence of metastasis in the computed tomography (CT) and (18)F-fluorodeoxyglucose positron emission tomography scans. We simultaneously performed a wide excision of both lesions and a left inguinal sentinel lymph node biopsy. Melanoma cells were identified in the sentinel lymph nodes, and left radical lymph node dissection was performed after a course of neoadjuvant chemotherapy. All the lymph nodes that were resected during the second operation tested negative for melanomas, and the plantar lesion was diagnosed as a stage IIIB malignant melanoma (pT4b, Na2, M0). Thereafter, we administrated four courses of chemotherapy, and 8 months after the operation, there was no evidence of recurrence or metastatic lesions. We present a case report of double cancer: a plantar malignant melanoma and vulvar EMPD, and also discuss the possible genetic mutations responsible for these two tumors.

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