title: Cytology of benign multicystic peritoneal mesothelioma in peritoneal washings.
abstract: OBJECTIVE
  To describe the cytological aspect of peritoneal washings in benign multicystic peritoneal mesothelioma (BMPM).
  
  
  METHODS
  Three peritoneal washing specimens stained by standard cytological and histological procedures and analysed by light microscopy.
  
  
  RESULTS
  The specimens showed an abundance of monomorphous mesothelial cells devoid of atypia or mitoses. The mesothelial cells were calretinin positive. They also showed numerous squamous metaplastic cells arranged in flat sheets or isolated cells. The background contained some inflammatory cells.
  
  
  CONCLUSIONS
  The combination of cytology of the peritoneal washing, histology (cell block and surgical specimen) and clinical history allow differentiation of BMPM from other cystic lesions (cystic lymphangioma and malignant mesothelioma).
authors.affiliation: Department of Pathology, Geneva University Hospital, Geneva, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Assaly
authors.forename: M
authors.initials: M
authors.lastname: Bongiovanni
authors.forename: N
authors.initials: N
authors.lastname: Kumar
authors.forename: J-F
authors.initials: JF
authors.lastname: Egger
authors.forename: M-F
authors.initials: MF
authors.lastname: Pelte
authors.forename: M
authors.initials: M
authors.lastname: Genevay
authors.forename: V
authors.initials: V
authors.lastname: Finci
authors.forename: E
authors.initials: E
authors.lastname: Tschanz
authors.forename: J-C
authors.initials: JC
authors.lastname: Pache
mesh_terms: D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods*; D018261:Mesothelioma, Cystic / Q000473:pathology*; D008853:Microscopy / Q000379:methods; D008875:Middle Aged; D009369:Neoplasms / Q000473:pathology*; D018297:Neoplasms, Cystic, Mucinous, and Serous / Q000473:pathology*; D010534:Peritoneal Neoplasms / Q000473:pathology*; D035583:Rare Diseases