Value of Diffusion-Weighted MR Imaging for the Detection of Nephritis

Figure 5

Pyelonephritis in a 31-year-old female patient of the left kidney who was imaged initially to assess the extent of renal involvement for possible operation and reimaged after 7 weeks of antibiotic therapy. Left column: a clear infectious focus can be easily seen on the DWI images and on the venous T1w images and the signal alterations of the kidney appear diffuse on T2w imaging. Right column: after successful antibiotic therapy with normal CRP value, no pathologic signal changes can be seen on the DWI images. The T1w and T2w images show moderate scarring of the formerly affected parenchyma (arrows).