Figure 15f.

Examples of stiffness patterns at MR elastography that can be correlated to findings at anatomic imaging in three different patients. (a, b) Constrictive pericarditis in a 65-year-old man. MR elastogram (a) shows peripheral increased stiffness (arrows on a), which is often seen with passive hepatic congestion and is not necessarily reflective of underlying hepatic fibrosis. The corresponding anatomic axial contrast-enhanced CT image (b) shows findings of congestive hepatopathy, including altered perfusion of the peripheral liver (arrowheads on b), a finding that corresponds to the region of increased stiffness. (c, d) Primary sclerosing cholangitis in a 55-year-old woman. MR elastogram (c) shows focal increased stiffness (arrow on c), and the anatomic axial T2-weighted MR image (d) shows that this finding corresponds to a dilated bile duct (arrowhead on d). (e, f) Autoimmune hepatitis in a 64-year-old woman. MR elastogram (e) shows diffusely abnormal liver stiffness, with focally increased stiffness in the right hepatic lobe (arrow on e); and the corresponding axial T2-weighted MR anatomic image shows that the focal stiffness corresponds to a region of confluent fibrosis (arrowheads on f).