title: Cytologic diagnosis of blastocystis hominis in peritoneal fluid: a case report.
abstract: BACKGROUND
  Blastocystis hominis is the most common parasite identified in s worldwide. Although it is commonly identified in stool preparations, unusual to encounter B hominis in abdominal fluid.
  
  
  METHODS
  A 46-year-old woman presented with the clinical impression of acute peritonitis. The initial radiologic evaluation showed free air in the abdominal cavity and an abdominal mass. Abdominal fluid submitted for cytologic examination was diagnostic of acute inflammation with mixed bacteria and abundant cystlike forms of B hominis. The patient underwent an exploratory laparotomy that revealed a poorly differentiated adenocarcinoma involving her bowel and peritoneum.
  
  
  CONCLUSIONS
  The present case highlights the unusual identification ofextraintestinal forms of B hominis in a peritoneal fluid sample from a patient with invasive, poorly differentiated adenocarcinoma and associated bowel perforation.
authors.affiliation: Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
authors.forename: Willmar D
authors.initials: WD
authors.lastname: Patino
authors.forename: Dominick
authors.initials: D
authors.lastname: Cavuoti
authors.forename: Suman K
authors.initials: SK
authors.lastname: Banerjee
authors.forename: Kevin
authors.initials: K
authors.lastname: Swartz
authors.forename: Raheela
authors.initials: R
authors.lastname: Ashfaq
authors.forename: Tunc
authors.initials: T
authors.lastname: Gokaslan
mesh_terms: D000230:Adenocarcinoma / Q000469:parasitology / Q000473:pathology*; D000818:Animals; D001202:Ascitic Fluid / Q000469:parasitology*; D016776:Blastocystis Infections / Q000469:parasitology / Q000473:pathology*; D016845:Blastocystis hominis / Q000302:isolation & purification*; D005260:Female; D006801:Humans; D007414:Intestinal Neoplasms / Q000469:parasitology / Q000473:pathology*; D008875:Middle Aged; D010534:Peritoneal Neoplasms / Q000469:parasitology / Q000473:pathology*