cutaneous melanoma spindle cell melanoma malignant spindle cell neoplasm desmoplastic melanoma MONDO:0044785 NCIT:C37257 A melanoma of the skin characterized by a proliferation of atypical spindled melanocytes in the dermis, in a background of abundant collagen. It usually presents as an amelanotic raised nodular lesion. MEDGEN:232127 desmoplastic melanoma UMLS:C1333280 desmoplastic cutaneous (skin) melanoma ONCOTREE:DESM