Radiation cystitis in a 72-year-old woman who had undergone total abdominal hysterectomy and radiation therapy for stage IC endometrial carcinoma. Axial follow-up T1-weighted (a) and fat-saturated T2-weighted (b) MR images demonstrate a small-volume urinary bladder with a thickened wall. Increased perirectal space due to fat deposition from radiation therapy is clearly seen on the T1-weighted image (arrow in a). The outer layer of the bladder has high signal intensity on the T2-weighted image.

Figure 12a.

Figure 12b.