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

Was this article helpful?

0 0
10 Ways To Fight Off Cancer

10 Ways To Fight Off Cancer

Learning About 10 Ways Fight Off Cancer Can Have Amazing Benefits For Your Life The Best Tips On How To Keep This Killer At Bay Discovering that you or a loved one has cancer can be utterly terrifying. All the same, once you comprehend the causes of cancer and learn how to reverse those causes, you or your loved one may have more than a fighting chance of beating out cancer.

Get My Free Ebook


Post a comment