transient hepatic intensity differences (THID)

Transient
hepatic intensity difference • Transient hepatic attenuation difference secondary to portal vein thrombosis - Ganzer Fall bei Radiopaedia
Voss Y, Transient hepatic attenuation difference secondary to portal vein thrombosis. Case study, Radiopaedia.org (Accessed on 07 Apr 2024) https://doi.org/10.53347/rID-50146 • CC by-nc-sa 3.0 (modified)
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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.

Pathology

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
Nonfocal lesions

These can be sectorial, polymorphous or diffuse and can arise from a variety of etiologies.

Siehe auch:
Assoziationen und Differentialdiagnosen zu transiente Intensitätsunterschiede der Leber: