title: Dropped gallstones post laparoscopic cholecystectomy mimicking peritoneal seeding: CT and ultrasound features.
abstract: OBJECTIVE
  The purpose of this work was to investigate the ultrasound (US) and CT features of dropped gallstones mimicking peritoneal seeding in patients after laparoscopic cholecystectomy (LCC).
  
  
  METHODS
  We describe the US and CT features of dropped gallstones mimicking peritoneal seeding in eight patients who underwent LCC. We also conducted a retrospective study of consecutive LCC patients who subsequently had CT to determine the prevalence of this condition.
  
  
  CONCLUSIONS
  The density of dropped gallstones on CT ranged from hypodense to partially or completely calcified nodules. Some stones did not have visible surrounding reaction, whereas others showed an enhancing halo. All stones were echogenic and demonstrated shadowing on US. The stones were located mostly on the right side of the abdomen, and the majority were around the liver. The prevalence of dropped gallstones post laparoscopic cholecystectomy was 4.2%.
authors.affiliation: Department of Medical Imaging, Sunnybrook and Women's College Health Sciences Center, Sunnybrook Campus, MG 130A, 2075 Bayview Avenue, Toronto, Ontario, Canada M4N 3M5. mostafa.atri@swchsc.on.ca
authors.forename: Mostafa
authors.initials: M
authors.lastname: Atri
authors.forename: Antony
authors.initials: A
authors.lastname: Bonifacio
authors.forename: Max
authors.initials: M
authors.lastname: Ryan
authors.forename: Frank L
authors.initials: FL
authors.lastname: Pilleul
authors.forename: Anthony
authors.initials: A
authors.lastname: Hanbidge
authors.forename: John
authors.initials: J
authors.lastname: Clark
authors.forename: John
authors.initials: J
authors.lastname: Murphy
mesh_terms: D000328:Adult; D000368:Aged; D017081:Cholecystectomy, Laparoscopic / Q000009:adverse effects*; D002769:Cholelithiasis / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D019300:Medical Errors; D008875:Middle Aged; D010532:Peritoneal Diseases / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography