title: Mastocytoma arising within a congenital nevocellular nevus.
mesh_terms: D006801:Humans; D007223:Infant; D008297:Male; D012515:Mast-Cell Sarcoma / Q000473:pathology*; D009506:Nevus / Q000151:congenital* / Q000473:pathology; D012878:Skin Neoplasms / Q000151:congenital* / Q000473:pathology