title: Agminated atypical (dysplastic) nevi: case report and review of the literature.
abstract: BACKGROUND
  Patients with the atypical mole syndrome have multiple dysplastic nevi that appear to be randomly distributed on certain preferred anatomical sites such as the upper back. These dysplastic nevi are thought to be acquired melanocytic nevi that begin appearing at puberty. To our knowledge, the presence of agminated atypical (dysplastic) nevi has not been reported.
  
  
  METHODS
  We describe a patient with the atypical mole syndrome who has more than 100 melanocytic nevi, many of which are clinically atypical and one of which proved to be a melanoma. Among his many melanocytic nevi is a cluster of approximately 50 nevi that are distributed in an area measuring 5 x 3 cm. The histopathologic features of these nevi are consistent with the diagnosis of "dysplastic nevus."
  
  
  CONCLUSIONS
  To our knowledge, agminated atypical (dysplastic) nevi have not been described previously. The presence of agminated atypical (dysplastic) nevi in a patient with the atypical mole syndrome can be theorized to arise because of loss of heterozygosity.
authors.affiliation: Dermatology Service, Memorial Sloan-Kettering Cancer Center, 1275 York Ave, New York, NY 10021, USA.
authors.forename: A A
authors.initials: AA
authors.lastname: Marghoob
authors.forename: R
authors.initials: R
authors.lastname: Blum
authors.forename: R
authors.initials: R
authors.lastname: Nossa
authors.forename: K J
authors.initials: KJ
authors.lastname: Busam
authors.forename: D
authors.initials: D
authors.lastname: Sachs
authors.forename: A
authors.initials: A
authors.lastname: Halpern
mesh_terms: D000328:Adult; D001706:Biopsy; D003937:Diagnosis, Differential; D004416:Dysplastic Nevus Syndrome / Q000145:classification / Q000473:pathology*; D006801:Humans; D008297:Male; D009626:Terminology as Topic