소형의 선천성 멜라닌세포성 모반에서 발생한 악성 흑색종 1예

Abstract

Malignant melanoma may arise de novo as well as in association with preexisting melanocytic nevi such as congenital and acquired melanocytic nevi. Although an increased risk for malignant melanoma arising in giant congenital melanocytic nevi seems to be well established, the risks associated with small or medium-sized congenital melanocytic nevi are matters of controversy. We report a case of malignant melanoma arising in a small congenital melanocytic nevus occurring in a 67-year-old man. He visited our hospital with a history of a pigmented lesion that had been present on his back since birth. Physical examination revealed a 0.9×0.8㎝ sized, brownish to black papule on his back. Histopathologic examination showed mature nevoid cell nests in the dermis associated with overlying atypical melanocytic lesion.