They are thought to be a physiological phenomenon caused by the dual hepatic blood supply. Geographic area of hypoattenuation on portal venous phase mr area of increased intensity on hepatic arterial phase that reverts to normal on portal venous phase depending on the size of the abnormality it can persist into portal venous phase as well, especially if related to tumors [4][5] the thaad interceptor carries no warhead, instead relying.
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They are considered a direct equivalent to transient hepatic attenuation differences (thad) seen with ct and transient hepatic echogenicity differences (thed) with ceus
A focal thid can arise from four pathological mechanisms.
Transient hepatic attenuation differences (thad) are areas of enhancement during the arterial phase of contrast ct of the liver Thad is thought to be a physiological phenomenon resulting from regional variation in the blood supply by the portal vein and/or the hepatic artery. Features on ct images are most consistent with transient hepatic attenuation differences (thad) that refer to the area of parenchymal enhancement visible during the hepatic artery phase, sometimes a physiological phenomenon caused by the dual hepatic blood supply. Arterioportal shunt between the left hepatic artery and left branch of portal vein, responsible for the patchy abnormal enhancement of the left hepatic lobe
Successful ablation of two hepatic focal lesions, no viable tumoral tissue detected. Designed to help the u.s Transient hepatic attenuation differences are areas of parenchymal enhancement visible during the hepatic arterial phase on helical ct [1, 2] Because of the wide diffusion of hepatic arterial phase evaluation, transient hepatic attenuation differences are now rather frequent.
