title: Syringocystadenoma papilliferum contiguous to a verrucous cyst.
abstract: BACKGROUND
  Syringocystadenoma papilliferum (SCAP) and verrucous cyst are two uncommon benign tumors. The simultaneous occurrence of the two lesions has not been reported before.
  
  
  METHODS
  We report four cases of the simultaneous occurrence of the two rare lesions as so-called collision lesions with a review of the literature.
  
  
  CONCLUSIONS
  The relationship of SCAP with viral infection needs further investigation.
authors.affiliation: Department of Pathology, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, LA 71130, USA. ali@lsuhsc.edu
authors.forename: Ailing
authors.initials: A
authors.lastname: Li
authors.forename: I Daniel
authors.initials: ID
authors.lastname: Sanusi
authors.forename: Jose R
authors.initials: JR
authors.lastname: Pena
authors.forename: Charn
authors.initials: C
authors.lastname: Nopajaroonsri
authors.forename: Micheal
authors.initials: M
authors.lastname: Kent
authors.forename: Bruce R
authors.initials: BR
authors.lastname: Smoller
mesh_terms: D006607:Adenoma, Sweat Gland / Q000473:pathology* / Q000821:virology; D000368:Aged; D003937:Diagnosis, Differential; D004814:Epidermal Cyst / Q000473:pathology* / Q000648:ultrastructure / Q000821:virology; D005260:Female; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D027383:Papillomaviridae / Q000648:ultrastructure; D030361:Papillomavirus Infections / Q000473:pathology*; D016133:Polymerase Chain Reaction; D012871:Skin Diseases / Q000473:pathology* / Q000821:virology; D013544:Sweat Gland Neoplasms / Q000473:pathology* / Q000821:virology; D014412:Tumor Virus Infections / Q000473:pathology; D014860:Warts / Q000473:pathology