title: Focal attenuation differences in pericystic liver tissue as seen on CT hepatic arteriography and CT arterial portography: observation using a unified helical CT and angiography system.
abstract: BACKGROUND
  To investigate nontumorous focal enhancement (FE) with computed tomographic hepatic arteriography (CTHA) and perfusion defect (PD) with computed tomographic arterial portography (CTAP) in pericystic liver tissue.
  
  
  METHODS
  Incidence, shape, and size of nontumorous FE on CTHA and PD on CTAP were examined in 100 consecutive noncirrhotic and 100 consecutive cirrhotic patients.
  
  
  RESULTS
  FE was observed on CTHA in 77 noncirrhotic and 61 cirrhotic patients, whereas PD was observed on CTAP in 50 noncirrhotic and 51 cirrhotic patients. When both findings were visualized in both CT studies, the shape of the FE on CTHA was similar to the overlapping PD on CTAP in 81% of patients but was larger in 92% of patients.
  
  
  CONCLUSIONS
  FE on CTHA and PD on CTAP are frequently noted in pericystic liver tissue. The size of FE on CTHA is often larger than PD on CTAP, although the shapes are generally the same. Size discrepancy suggests the presence of both portal supply and splanchnic venous drainage.
authors.affiliation: Department of Diagnostic Radiology, Aichi Cancer Center Hospital, 1-1 Kanokoden, Chikusa-ku, Nagoya 464-8681, Japan,
authors.forename: Y
authors.initials: Y
authors.lastname: Inaba
authors.forename: Y
authors.initials: Y
authors.lastname: Itai
authors.forename: Y
authors.initials: Y
authors.lastname: Arai
authors.forename: K
authors.initials: K
authors.lastname: Matsueda
authors.forename: T
authors.initials: T
authors.lastname: Yamagami
authors.forename: S
authors.initials: S
authors.lastname: Sueyoshi
authors.forename: Y
authors.initials: Y
authors.lastname: Takeuchi
mesh_terms: D016009:Chi-Square Distribution; D003287:Contrast Media; D003560:Cysts / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D006499:Hepatic Artery; D006801:Humans; D008099:Liver / Q000098:blood supply / Q000000981:diagnostic imaging*; D008103:Liver Cirrhosis / Q000000981:diagnostic imaging / Q000473:pathology; D011172:Portography; D013382:Subtraction Technique; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media