title: [Merkel cell carcinoma. A rare differential keratoacanthoma diagnosis].
abstract: A 90 year old woman presented with a rapidly growing nodular tumor at the tip of the nose. Clinically, keratoakanthoma was tentatively diagnosed. Histological examination, however, revealed Merkel cell carcinoma. This case supports the necessity of a surgical excision with a subsequent histological examination even when the clinical aspect is suggestive for keratoacanthoma.
authors.affiliation: HNO Klinik und Poliklinik der Universität Ulm.
authors.forename: J A
authors.initials: JA
authors.lastname: Schwab
authors.forename: C
authors.initials: C
authors.lastname: Rose
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015266:Carcinoma, Merkel Cell / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007636:Keratoacanthoma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis / Q000473:pathology / Q000601:surgery; D009666:Nose / Q000473:pathology; D009669:Nose Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery