title: Mucoepidermoid carcinoma arising within nevus sebaceus of Jadassohn.
abstract: BACKGROUND
  Nevus sebaceus (NS) of Jadassohn is a common congenital lesion associated with numerous benign and malignant tumors. However, mucoepidermoid carcinoma (MEC) has not been described in association with NS.
  
  
  METHODS
  We describe an unusual case of MEC arising within NS.
  
  
  RESULTS
  A 72-year-old man presented with an enlarging plaque on his forehead, along the hairline. Physical examination revealed a mounded, erythematous lesion that was completely excised. Histological evaluation revealed a typical MEC with areas of squamous and adenomatous differentiation with foci of typical intermediate cells.
  
  
  CONCLUSIONS
  The diagnosis of MEC is an important one, because it portends a poor prognosis, requiring long follow-up. This is, to our knowledge, the first report of MEC arising within NS.
authors.affiliation: Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA.
authors.forename: A Hafeez
authors.initials: AH
authors.lastname: Diwan
authors.forename: Kathleen J
authors.initials: KJ
authors.lastname: Smith
authors.forename: R
authors.initials: R
authors.lastname: Brown
authors.forename: Henry G
authors.initials: HG
authors.lastname: Skelton
mesh_terms: D000368:Aged; D018277:Carcinoma, Mucoepidermoid / Q000473:pathology*; D006801:Humans; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D009506:Nevus / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*; D013544:Sweat Gland Neoplasms / Q000473:pathology*