Parenchymal Compression

Diaphragmatic compression of liver parenchyma due to contraction of diaphragmatic muscle bundles may create hypodense pseudonodular areas especially in segments VII and VIII of the liver. This is a typical occurrence at the time of the CT or MR examination when patients inspire deeply causing a focal increase in tissue pressure in the sub-capsular region. The result is a decrease in portal perfusion while the hepatic arterial perfusion remains relatively unchanged (Fig. 24).

Pseudolesions due to rib compression are observed in approximately 15% of patients, and are most commonly seen in the sub-capsular region of liver segments V and VI [47].

Fig. 22a, b. Segmental hypertrophy. Same case as demonstrated in Fig. 21. On the CT examination the liver is dysmorphic in appearance, with pseudotumoral hypertrophy of segment I (asterisk). This segment appears hyperdense on the pre-contrast image (a) as compared with the surrounding liver parenchyma that is affected by the sclerosing cholangitis. Note the dilatation of-bile ducts as typically seen in primary sclerosing cholangitis (arrows). On the post-contrast image (b) the hypertrophy shows normal perfusion and is seen with comparable density to the surrounding liver tissue

Fig. 22a, b. Segmental hypertrophy. Same case as demonstrated in Fig. 21. On the CT examination the liver is dysmorphic in appearance, with pseudotumoral hypertrophy of segment I (asterisk). This segment appears hyperdense on the pre-contrast image (a) as compared with the surrounding liver parenchyma that is affected by the sclerosing cholangitis. Note the dilatation of-bile ducts as typically seen in primary sclerosing cholangitis (arrows). On the post-contrast image (b) the hypertrophy shows normal perfusion and is seen with comparable density to the surrounding liver tissue

Eovist Liver Mri Hemangioma

Fig. 23a-e. Segmental hypertrophy. On the GRE T1-weighted "in-phase" (a) and "out-of-phase" (b) images the liver hypertrophy (arrows) appears slightly hyperin-tense. The dynamic study after contrast agent administration (c-e) shows normal vascularization compared to the surrounding liver

Fig. 23a-e. Segmental hypertrophy. On the GRE T1-weighted "in-phase" (a) and "out-of-phase" (b) images the liver hypertrophy (arrows) appears slightly hyperin-tense. The dynamic study after contrast agent administration (c-e) shows normal vascularization compared to the surrounding liver

Fig. 24a-c. Parenchymal compression. On the pre-contrast T2-weighted (a) and GRE Tl-weighted (b) images, a round, slightly hypointense lesion (arrow) can be seen. In the arterial phase after contrast agent administration (c) the area appears hypointense due to changes in hepatic arterial perfusion e a

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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