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malignant melanoma
a malignant skin tumor, usually developing from a nevus and consisting of dark masses of cells with a marked tendency to metastasis. It is not common, but its incidence is increasing
and it is the most aggressive type of skin cancer. It arises from pigment- (melanin-) producing cells and varies in course and prognosis according to type. Types include superficial spreading melanoma, nodular
malignant melanoma, and lentigo maligna melanoma. In general, the superficial lesions can be cured by surgical excision of
the mole and adjacent tissues. Deeper lesions tend to metastasize rapidly through the lymphatic and circulatory systems. In
some cases the condition has a genetic component. Early detection and skin protection are key in its control.
Copyright 2007. An Elsevier publication. All rights reserved.
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