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RadioGraphics, Vol 16, 825-840, Copyright © 1996 by Radiological Society of North America

ARTICLES

Imaging of complications in liver transplantation

HV Nghiem, K Tran, TC Winter 3rd, UP Schmiedl, SJ Althaus, NH Patel and PC Freeny
University of Washington, Department of Radiology, Seattle 98195, USA.

Hepatic transplantations are being performed with increasing frequency, leading to greater demand for accurate evaluation of related complications. Ultrasonography (US) is the primary screening technique for detection of vascular complications of hepatic transplantation: angiography is used to confirm the US findings or when the US study is suboptimal. Hepatic artery thrombosis, the most common (as high as 42% of pediatric cases; 4%-12% of adult cases) and important vascular complication, may be associated with bilomas, infarcts, or abscesses at gray-scale US and absence of proper hepatic and intrahepatic arterial flow at Doppler analysis. Hepatic artery stenosis (seen in 11% of cases) is suspected if a focal accelerated velocity of greater than 2-3 m/sec with turbulence is seen at or distal to the stenosis or if a tardus parvus pattern of intrahepatic arterial flow is seen. In cases of inferior vena cava thrombosis and stenosis, US may show echogenic thrombus or obvious narrowing, with a substantially increased flow velocity through the stenosis or reversal of flow in the hepatic veins. Biliary complications occur relatively often (13%-25% of cases) after liver transplantation; bile leakage and biliary stricture, the most common biliary complications, are seen as a fluid collection and a stricture, respectively. Although acute rejection is one of the most serious complications affecting graft survival, it cannot be reliably detected with available diagnostic tests or radiologic methods.


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