title: Giant cutaneous horn on the lower lip.
abstract: Cutaneous horn is a conical hyperkeratotic projection of the skin composed of compact keratin. A wide range of pathologic conditions may be found at its base, including a significant proportion of malignant tumors. A notable, giant cutaneous horn uncovering a keratoacanthoma/well-differentiated squamous cell carcinoma is presented, highlighting the importance of histopathological examination to rule out malignancy because clinical features cannot assure a correct diagnosis.
authors.affiliation: Department of Dermatology, Centro Hospitalar do Porto - Hospital de Santo António, Porto, Portugal.
authors.forename: Teresa
authors.initials: T
authors.lastname: Pinto-Almeida
authors.forename: Ana
authors.initials: A
authors.lastname: Oliveira
authors.forename: Glória
authors.initials: G
authors.lastname: da Cunha Velho
authors.forename: Rosário
authors.initials: R
authors.lastname: Alves
authors.forename: Mónica
authors.initials: M
authors.lastname: Caetano
authors.forename: Manuela
authors.initials: M
authors.lastname: Selores
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D006801:Humans; D007636:Keratoacanthoma / Q000473:pathology*; D008048:Lip Neoplasms / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D012878:Skin Neoplasms / Q000473:pathology*