title: Malignant amelanotic melanoma--a rare tumor.
mesh_terms: D005887:Gingival Neoplasms / Q000473:pathology*; D006801:Humans; D008297:Male; D008339:Mandibular Neoplasms / Q000473:pathology; D008545:Melanoma / Q000473:pathology*; D008875:Middle Aged