title: Mammary epidermoid inclusion cysts after wide-core needle biopsies.
abstract: OBJECTIVE
  To investigate the prevalence of squamous epidermoid inclusion cysts after wide-core needle biopsy.
  
  
  RESULTS
  Epidermoid inclusion cysts were found in five of 17 surgical excisions (29%) after preliminary wide-core needle biopsies in a 7-month period. Thereafter they were not seen in 26 subsequent postwide-core surgical excisions in a period of 6 months.
  
  
  CONCLUSIONS
  The cysts appear to be an iatrogenic complication of wide-core biopsy, and need morphological recognition in order to avoid confusion with spontaneous squamous metaplasia of benign or malignant breast epithelium. Longer term implications are unknown.
authors.affiliation: Regional Breast Pathology Unit, University of Bristol, Southmead Hospital, UK.
authors.forename: J D
authors.initials: JD
authors.lastname: Davies
authors.forename: A
authors.initials: A
authors.lastname: Nonni
authors.forename: H F
authors.initials: HF
authors.lastname: D'Costa
mesh_terms: D001707:Biopsy, Needle / Q000009:adverse effects* / Q000295:instrumentation / Q000379:methods; D001941:Breast Diseases / Q000209:etiology* / Q000473:pathology*; D004814:Epidermal Cyst / Q000209:etiology* / Q000473:pathology*; D005260:Female; D006801:Humans