MALIGNANT-MELANOMA DEVELOPING FROM AN INTRADERMAL NEVUS

A 58-year-old man presented a black nodule with satellites located in the left upper region of the umbilicus. Clinical history and microscop ic findings led us to diagnose it as a malignant melanoma developing f rom an intradermal nevus. Histopathologically, melanoma cells develope d upward from the nest of the intradermal nevus and no junctional acti vity was shown. Cases of malignant melanoma arising from an intraderma l nevus have rarely been reported. Moreover, previously reported cases showed melanoma cells beneath the intradermal nevus.