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home - Liver - Liver Imaging - Liver Imaging CT Written by Dr Sebastian Zeki

Liver Imaging CT

CT Types:Conventional CT scanning.Helical (spiral) CT scanning.Lipiodol-enganced scan. Clinical UseAssessment of Obstructive Jaundice.Examination of the biliary tree.Assessment of liver abscesses.Diagnosis of Budd Chiari.Small liver lesions. CT Helical CT (get arterial and venous phases in one breath hold) is superior to conventional CT in detecting and characterizing the vascularity of liver tumours. Lipiodol is selectively concentrated in tumor tissue so can enhance HCC after 7-14 days CT shows what USS shows as well as extra-biliary structures eg LN/ pancreas CT cholangiography accurately depicts biliary anatomy and has been used for the workup of living donor candidates for right lobe transplantation. Better than ultrasound for identifying small abscesses, extrahepatic fluid collections, and air and calcification.Cant differentiate a tumor from abscess; biopsy or aspiration is needed Most likely to depict changes secondary to venous occlusion such as ascites and hepatic enlargement, especially in the caudate lobe.IV contrast will demonstrate the characteristic patchy central enhancement with poor peripheral enhancement, and absence of contrast material in one or more of the hepatic veins.In chronic cases, the hepatic veins are usually not visualized, the caudate lobe is enlarged and enhanced, and the portal vein is patent.Portal flow direction is better evaluated on Doppler USS. USS better than conventional CT for small lesions (1-2cm)Dynamic CT involves the rapid infusion of intravenous contrast-During the vascular phase can identify lesions such as HCC.During portal phase can identify CRC mets Written by Dr Sebastian Zeki

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