Although urinary bladder ruptures can be seen in penetrating and blunt trauma, the latter is responsible for most of the cases. The probability of bladder injuries is related to the degree of bladder distention at the time of the trauma. Mortality caused by associated injuries can be as high as 44%. Delay in the diagnosis can lead to substantially increased morbidity and mortality 1.
Sandler et al. divided the bladder injuries into five types, as follows 1:
type I: contusion - partial or incomplete tear of the mucosa
type II: intraperitoneal rupture - usually caused by blunt trauma while the patient has a distended bladder, allowing for rupture of the bladder dome
type III: interstitial injury - intramural or partial-thickness laceration with an intact serosa
type IV: extraperitoneal - most commonly seen in penetrating trauma
type V: combined rupture - simultaneous intra- and extraperitoneal rupture
Determining the type of rupture is fundamental since treatment and prognosis are different for each type. Most contusions, interstitial injuries and extraperitoneal ruptures can be treated solely with catheterization, whereas intraperitoneal and combined ruptures require laparotomy in most cases 1.
In the presented case, excretory phase CT alone sufficed to demonstrate contrast extravasation. However, usually a very delayed phase (15 to 30 min) is necessary to confirm bladder rupture, and that may not be feasible in busy emergency departments. A CT cystography can be used to determine the presence of bladder rupture without a need for further delaying examination 1.