title: Collision tumour--an unusual skin lesion.
authors.forename: M V
authors.initials: MV
authors.lastname: McKiernan
authors.forename: J J
authors.initials: JJ
authors.lastname: McCann
mesh_terms: D000328:Adult; D002281:Carcinoma, Basosquamous / Q000473:pathology*; D005153:Facial Neoplasms / Q000473:pathology*; D006801:Humans; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D011379:Prognosis; D012878:Skin Neoplasms / Q000473:pathology*