Transient hepatic attenuation differences (THAD) are areas of enhancement during the arterial phase of

contrast CT Contrast CT, or contrast enhanced computed tomography (CECT), is X-ray computed tomography (CT) using radiocontrast. Radiocontrasts for X-ray CT are generally iodine-based types. This is useful to highlight structures such as blood vessels tha ...

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. THAD may in some cases be associated with liver tumors such as a hepatocellular carcinoma.

References

Hepatology Radiology Medical imaging {{med-diagnostic-stub