title: Isolated perihepatic tuberculosis: imaging findings.
abstract: OBJECTIVE
  To review the imaging findings of isolated perihepatic tuberculosis without coexistent active tuberculosis elsewhere in the body.
  
  
  METHODS
  Over a 9-year period, six patients with histopathologically proven perihepatic tuberculosis without simultaneous active tuberculosis elsewhere in the body were included in this study. Two radiologists retrospectively evaluated in consensus the location (right, left, or both perihepatic spaces), size (maximum diameter), morphology (ovoid or round), number, attenuation (low-, iso-, or high-attenuation compared with the adjacent liver parenchyma), and the presence or absence of contrast enhancement of the lesions on computed tomography (CT), and echogenicity (low-, iso-, or high-echogenicity compared with the adjacent liver parenchyma) of the lesions on ultrasonography.
  
  
  RESULTS
  On CT, an isolated perihepatic lesion was located in the right perihepatic space in five patients, whereas three lesions were located in both perihepatic spaces in the remaining patient. The mean maximum diameter of the isolated perihepatic tuberculosis lesions was 29.7 mm. Isolated perihepatic tuberculosis appeared as an ovoid-shaped, homogeneous, and low-attenuating (n=5) or high-attenuating (n=1) lesion relative to the liver. There was peripheral rim enhancement of the lesion in two patients. On ultrasonography, isolated perihepatic tuberculosis was revealed as a homogeneous, low-echoic (n=5) or iso-echoic (n=1) lesion relative to the liver.
  
  
  CONCLUSIONS
  Although various inflammatory or malignant lesions can be located in the perihepatic space, isolated perihepatic tuberculosis appears an ovoid-shaped, homogeneous, and low-attenuating or low-echoic lesion compared with the liver parenchyma on CT or ultrasonography.
authors.affiliation: Department of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea.
authors.forename: H J
authors.initials: HJ
authors.lastname: Kim
authors.forename: J H
authors.initials: JH
authors.lastname: Byun
authors.forename: D Y
authors.initials: DY
authors.lastname: Kim
authors.forename: H J
authors.initials: HJ
authors.lastname: Won
authors.forename: Y M
authors.initials: YM
authors.lastname: Shin
authors.forename: H K
authors.initials: HK
authors.lastname: Ha
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D014386:Tuberculosis, Hepatic / Q000000981:diagnostic imaging* / Q000473:pathology; D014463:Ultrasonography