malignant melanoma in situ


Also found in: Acronyms.

ma·lig·nant mel·a·no·ma in si·tu

a melanoma limited to the epidermis and composed of nests of atypical melanocytes and scattered single cells extending into the upper epidermis; local excision is curative although the lesion, if untreated, may soon invade the dermis. Malignant lentigo may be considered a slowly progressive type of malignant melanoma in situ.
References in periodicals archive ?
6-8) In some cases, DMM may arise in a preexisting malignant melanoma in situ of the lentiginous (so-called lentigo maligna) type.
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