Aug 28, 2024 · Transient hepatic attenuation differences (THAD) lesions refer to areas of parenchymal enhancement visible during the hepatic artery phase on helical CT. They are thought to be 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.

Nov 23, 2012 · Hepatic arterial phase CT scan shows homogeneous high-attenuation mass in left lobe and concomitant transient hepatic attenuation difference (THAD). Peripheral small portal vein branch ( arrow ) is visualized early in area of THAD.

Aug 1, 2004 · Arterial phase helical CT scan reveals transient hepatic attenuation difference in left lobe (segments II, III, IV) (arrows) surrounding two hemangiomas that are not yet enhanced. Relative hypertrophy of left hepatic artery (arrowhead) is also present.

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.

Jan 10, 2016 · A transient hepatic attenuation difference (THAD) or transient hepatic intensity difference (THID) is seen during biphasic liver computed tomography (CT) or magnetic resonance imaging (MRI). It refers to an area of nontumorous increased or decreased attenuation on arterial phase images, which becomes isoattenuating on portal-phase images.

Nov 16, 2016 · Compensatory increased flow through the hepatic artery accounts for the posterior segmental transient hepatic attenuation difference (THAD). Ascites is also noted due to hepatic injury from the portal vein thrombosis.

Jan 13, 2008 · Transient hepatic attenuation differences (THAD) are areas of enhancement on hepatic arterial phase imaging computed tomography that occur as a result of a localized variation in the proportion of hepatic arterial and portal venous supply.

Oct 1, 2009 · Transient hepatic attenuation differences (THADs) are the imaging manifestation of regional variations in the balance between hepatic arterial, portal venous, and third inflow sources of hepatic blood flow.

We elucidate the characteristic findings and the causes of THAD in patients without hepatic neoplasm in this article. Dual-phased contrast-enhanced CT studies performed in 450 patients were reviewed, and THAD was observed in 42 (9.3%).