A 72-year-old diabetic woman presents with a 3-day history of abdominal pain and dysuria.

Fig. 121.1 (A–C) Axial noncontrast CT images through the AQ3 pelvis demonstrate gas within the wall of the urinary bladder. Gas is also present within the lumen of the bladder.

Emphysematous cystitis

• Gas in the bladder wall:
  
  
  
  • None
  
  
• Gas in the lumen of the bladder:
  
  
  
  • Recent instrumentation
    
  • Bladder fistula (vesicovaginal, colovesical, enterovesical)
    
  • Truma