:Comparison with Portographic Findings of the Pars Umbilicus of the Portal Vein

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99mTc-phytate liver scan and percutaneous transhepatic portography (PTP) were performed in 33 patients with portal hypertension due to various hepatic diseases. A defect or space occupying lesion in the left lobe on the scan in these patients was analysed with reference to portographic changes of the pars umbilicus of the left portal vein and the following results were obtained.1) A false-positive defect on the scintigram was found in 6 (18.2%) of 33 patients, and portal vein pressure (PVP) was above 200mm H2O in all 6 which constituted 21.4% of 28 with PVP above 200mm H2O.2) In five out of 6 patients with false-positive scan findings, the pars umbilicus was dilated to more than 25×15mm in size, and it was huge and tortuous in 3 of them.3) The mean PVP in the group with a false-positive scan tended to be higher than that in patients with no abnormalities on the scintigram.It was concluded that in reading of liver scintigrams in patients with portal hypertension, a dilated pars umbilicus and huge para-umbilical vein should be considered.
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