This site is targeted at medical and radiology professionals, contains user contributed content and material that may be confusing to a lay audience. Use of this site implies acceptance of our Terms of Use.

Transient hepatic intensity differences

Transient hepatic intensity differences (THIDs) are a phenomenon observed on MRI imaging of the liver. They are considered a direct equivalent to transient hepatic attenuation differences (THADs) noted on CT. They may be focal or nonfocal.


Focal lesions

A focal THID lesion can arise from four pathological mechanisms

  • directly by a siphoning effect (lobar multisegmental shape)
  • indirectly by means of portal hypoperfusion (sectorial shape) due to portal branch compression or infiltration
  • by thrombosis resulting in a portal branch blockade
  • by flow diversion caused by an arterioportal shunt
Non focal lesions

These can be diffuse, polymorphous or diffuse and can arise from varying aetiology

Updating… Please wait.


Error Unable to process the form. Check for errors and try again.

Alert_accept Thank you for updating your details.