Fig. 6.

Acute infectious cystitis with mural bladder abscess in an 89-year-old man with acute urinary retention, fever, leukocytosis and impaired renal function. Unenhanced MRI including MR pyelographic (a) and axial fat-suppressed (b) images revealed bilateral hydronephrosis, contracted bladder and prominent inflammatory changes (+) in the surrounding extraperitoneal fat planes. Additionally, sagittal T2-weighted image (c) showed a focal thickening (arrows) at the bladder dome, with intramural fluid collection (arrowhead). Repeated CT (d) after medical treatment revealed the disappearance of abnormal mural changes