title: Hepatic parenchymal perfusion abnormalities after pancreaticobiliary surgery. Evaluation with dynamic helical CT.
abstract: OBJECTIVE
  To evaluate perfusion abnormalities of the liver after pancreaticobiliary surgery.
  
  
  METHODS
  We retrospectively evaluated 128 patients with pancreaticobiliary malignant tumors who had been examined both before and after surgery by means of helical CT of the liver. An infusion of 3 ml/s of 60% nonionic contrast material was followed by helical CT of the liver in a sequential arterial phase, portal venous phase, and equilibrium phase.
  
  
  RESULTS
  Of 128 patients, we followed 97. In 21 patients (22%) we found 47 lesions with perfusion abnormalities that were detected 1-33 months (mean 6.6 months) after the operation. All patients were asymptomatic. The shape of each perfusion abnormality was characterized as geographic (n = 23, 47%), wedge-shaped (n = 21, 45%), or round (n = 3, 8%). The abnormalities were seen in the arterial phase in 46 lesions (98%), in the portal venous phase in 18 lesions (38%), and in the equilibrium phase in 1 lesion (0.2%). In all lesions, the size either decreased spontaneously, or it remained unchanged for more than one year.
  
  
  CONCLUSIONS
  Perfusion abnormalities of the liver may occur in patients who undergo pancreaticobiliary surgery. This findings should not be confused with hypervascular metastases.
authors.affiliation: Department of Radiology, Kumamoto University School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Mitsuzaki
authors.forename: Y
authors.initials: Y
authors.lastname: Yamashita
authors.forename: I
authors.initials: I
authors.lastname: Ogata
authors.forename: T
authors.initials: T
authors.lastname: Nishiharu
authors.forename: J
authors.initials: J
authors.lastname: Urata
authors.forename: M
authors.initials: M
authors.lastname: Takahashi
mesh_terms: D000368:Aged; D001662:Biliary Tract Surgical Procedures / Q000009:adverse effects; D013505:Digestive System Surgical Procedures / Q000009:adverse effects; D005260:Female; D006801:Humans; D008102:Liver Circulation; D008107:Liver Diseases / Q000000981:diagnostic imaging* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D010179:Pancreas / Q000601:surgery; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods