title: Primary in situ squamous cell carcinoma of the endometrium, with extensive squamous metaplasia and dysplasia.
abstract: BACKGROUND
  Primary squamous cell carcinoma of the endometrium is exceedingly rare. It has been described in association with pyometra but its etiology is still unclear.
  
  
  METHODS
  The authors report the case of a 75-year-old woman who presented with pelvic pain and pyometra. No gross tumor was identified in the uterus; however, extensive epidermalization of the endometrial mucosa was noted. Microscopic findings were consistent with a primary in situ squamous carcinoma of the endometrium associated with extensive squamous metaplasia and areas of dysplasia. HPV antigen and DNA detection were negative in both the endometrial lesions and the cervix.
  
  
  CONCLUSIONS
  These results support the sequence of change with squamous metaplasia, progressing through dysplasia to carcinoma as a possible pathogenetic process. HPV's role, however, remains uncertain.
authors.affiliation: Pathology Department, La Rabta Hospital, Tunis, Tunisia. yossrazidi@yahoo.fr
authors.forename: Y S H
authors.initials: YS
authors.lastname: Zidi
authors.forename: S
authors.initials: S
authors.lastname: Bouraoui
authors.forename: K
authors.initials: K
authors.lastname: Atallah
authors.forename: N
authors.initials: N
authors.lastname: Kchir
authors.forename: S
authors.initials: S
authors.lastname: Haouet
mesh_terms: D000368:Aged; D002278:Carcinoma in Situ / Q000473:pathology*; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D016889:Endometrial Neoplasms / Q000473:pathology*; D005260:Female; D006801:Humans