title: Metastatic renal-cell carcinoma presenting as a cutaneous horn.
abstract: Renal-cell carcinoma develops as an insidious neoplasm, frequently metastasizing to the skin. Cutaneous manifestations vary regarding morphology and sites of predilection. A patient was recently seen demonstrating a metastasis from a renal neoplasm. The lesion was unusual in that it grossly resembled a cutaneous horn. Dermatologists should continue to be alert to the possibility of renal tumor metastasis when evaluating cutaneous tumors.
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis / Q000473:pathology / Q000556:secondary*; D001706:Biopsy; D003937:Diagnosis, Differential; D005546:Forehead; D006801:Humans; D007642:Keratosis / Q000175:diagnosis* / Q000473:pathology; D007680:Kidney Neoplasms / Q000175:diagnosis* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D012878:Skin Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000556:secondary*