title: Endometrial squamous metaplasia. An unusual response to progestin therapy of hyperplasia.
abstract: OBJECTIVE
  To report the finding of squamous metaplasia within endometrial glands occurring as a result of progestin therapy of hyperplasia.
  
  
  METHODS
  Case series. Retrospective analysis of two cases from 9235 accessioned endometrial biopsies.
  
  
  METHODS
  Hospital-based pathology laboratory processing inpatient and outpatient specimens.
  
  
  METHODS
  Two women, ages 49 and 34 years, with endometrial hyperplasia without squamous metaplasia who were treated with progestin.
  
  
  RESULTS
  Extensive squamous metaplasia was found in endometrial glands following progestin therapy. The post-therapy biopsies also showed progestin-related alterations but no evidence of active hyperplasia.
  
  
  CONCLUSIONS
  Squamous metaplasia in these cases appears to be a consequence of progestin therapy. The absence of hyperplasia in the progestin-treated endometrium suggests that the squamous metaplasia does not represent persistence or progression of the original hyperplastic lesion.
authors.affiliation: Department of Pathology, Crouse Irving Memorial Hospital, Syracuse, NY 13210, USA.
authors.forename: M C
authors.initials: MC
authors.lastname: Miranda
authors.forename: M T
authors.initials: MT
authors.lastname: Mazur
mesh_terms: D000328:Adult; D001706:Biopsy; D004714:Endometrial Hyperplasia / Q000188:drug therapy*; D004717:Endometrium / Q000473:pathology*; D005260:Female; D006801:Humans; D008679:Metaplasia / Q000139:chemically induced; D008875:Middle Aged; D011372:Progestins / Q000009:adverse effects* / Q000627:therapeutic use; D012189:Retrospective Studies
chemical_list: D011372:Progestins