· Can be secondary to traumatic or iatrogenic injury

· Five types of rupture

o Type I: Bladder contusion -  Most common form, Results from incomplete tear of bladder mucosa. Cystography is normal

 

o Type II: Intraperitoneal rupture-Results from trauma to lower abdomen when bladder is distended. Because bladder dome is weakest portion, it ruptures most easily. Contrast is then seen in the paracolic gutters and between loops of small bowel

 

o Type III: Interstitial injury-rare- Caused by a tear of the serosal surface. Mural defect without extravasation will be seen

 

o Type IV: Extraperitoneal -  Almost always associated with pelvic fractures. Usually close to base of bladder anterolaterally. Subdivided into· Simple, with extravasation limited to perivesical space· Complex, with extravasation extending to thigh, scrotum or perineum

 

o Type V: Combined extra- and intraperitoneal rupture

 

· Extraperitoneal bladder rupture is the most common typeo Occurs in 80% of bladder rupture cases. Extraperitoneal bladder rupture generally secondary to adjacent pelvic fracture or an avulsion tear at fixation points of puboprostatic ligaments·

 Intraperitoneal bladder rupture Usually iatrogenic or secondary to penetrating injury. Blunt trauma more likely to result in intraperitoneal rupture in children than in adults. Because the pediatric bladder is more intraperitoneal in location. The adult bladder dome remains mostly extraperitoneal· Blunt trauma in an adult can result in intraperitoneal rupture only if the bladder is fully distended.
 
Imaging findings of intraperitoneal rupture- Contrast extravasation into paracolic gutters.  Contrast outlining small bowel loops· While extraperitoneal bladder rupture can be treated conservatively, intraperitoneal bladder rupture requires surgical repair· Highest morbidity and rupture mortality is associated with intraperitoneal rupture because of potential for development of chemical peritonitis·

Imaging findings of extraperitoneal rupture - Diagnostic evaluation of bladder rupture includes voiding cystourethrography (VCUG) or CT scan·

 Voiding cystourethrography historically been preferred contrast enhanced study for diagnosis of bladder rupture· Bladder needs to be fully distended and evaluation of a post-voiding film essential.

Plain film:· 
\"Pear-shaped\" bladder·
Upward displacement of ileal loops· 
Flame-shaped contrast extravasation into perivesical fat. Best seen on post void films. May extend into thigh / anterior abdominal wall