title: Pericaval fat collection mimicking an intracaval lesion on CT in patients with chronic liver disease.
abstract: BACKGROUND
  Localized fat collections, which mimic fat-containing lesions of the inferior vena cava (IVC) on computed tomographic (CT) images, have been reported as rare incidental findings. Our goal was to evaluate the association of this CT finding with chronic liver disease.
  
  
  METHODS
  Sixty-one patients with chronic liver disease were prospectively studied with contrast-enhanced abdominal CT. The prevalence, attenuation, location, shape, and size of the pericaval fat collections were assessed. Multidirectional reformatted CT images were obtained from helical CT data to identify origins of the pericaval fat collections. Sixty-one patients without chronic liver disease were studied as control subjects.
  
  
  RESULTS
  Pericaval fat collections were seen on abdominal CT in 16 (26.2%) of the 61 patients. On the reformatted images, the fat collections were contiguous to the fat tissue around the subdiaphragmatic esophagus in all 16 patients. The fat collections were located at the posterior aspect of the IVC in 12 patients. In the control group, pericaval fat collection mimicking an intracaval lesion was not seen.
  
  
  CONCLUSIONS
  In patients with chronic liver disease, pericaval fat collections are not rare CT findings and their characteristic location is considered to be posterior to the IVC. It is important not to misinterpret such CT findings as abnormalities of the IVC, such as thrombus or tumors.
authors.affiliation: Department of Radiology, Matsuyama Red Cross Hospital, 1 Bunkyo-machi, Matsuyama-shi 790-8524, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Gibo
authors.forename: S
authors.initials: S
authors.lastname: Murata
authors.forename: S
authors.initials: S
authors.lastname: Kuroki
mesh_terms: D000273:Adipose Tissue / Q000000981:diagnostic imaging*; D000368:Aged; D016022:Case-Control Studies; D003287:Contrast Media; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007479:Iopamidol; D008107:Liver Diseases / Q000000981:diagnostic imaging*; D008297:Male; D015995:Prevalence; D011446:Prospective Studies; D014057:Tomography, X-Ray Computed; D014682:Vena Cava, Inferior / Q000000981:diagnostic imaging*
chemical_list: D003287:Contrast Media; D007479:Iopamidol