Bladder Rupture

• Mechanism of injury: Blunt abdominal/pelvic trauma (most common — MVC, falls, crush injuries), penetrating trauma (GSW, stab wounds), or spontaneous rupture [1-2]
• Key HPI questions:
  • Timing and mechanism of trauma; was the bladder distended at time of injury?
  • Presence and character of hematuria (gross vs. microscopic)
  • Ability to void since injury; urine output
  • Abdominal pain — location, onset, progression
  • Alcohol intoxication at time of injury (risk factor for both trauma and spontaneous rupture) [3-4]
  • Prior pelvic radiation, bladder surgery, or neurogenic bladder
  • Last void before injury (distended bladder increases risk of intraperitoneal rupture at the dome) [1]
• Symptom characterization: Abdominal pain (76% of spontaneous cases), progressive abdominal distension, oliguria/anuria, inability to void, suprapubic tenderness [1][3]
• Associated symptoms: Dyspnea (from abdominal distension), nausea, shoulder pain (referred from diaphragmatic irritation by urinary ascites)

• Gross hematuria with pelvic fracture — bladder injury present in ~30% of these cases [2]
• Inability to void or markedly decreased urine output
• Progressive abdominal distension with peritoneal signs → suspect intraperitoneal rupture with urinary peritonitis [1][4]
• Rising creatinine/BUN disproportionate to clinical picture → "pseudo-AKI" from peritoneal reabsorption of urine ("reverse peritoneal dialysis") [4]
• Hemodynamic instability with pelvic fracture
• Signs of sepsis or frank peritonitis
• Pneumoperitoneum on imaging without obvious hollow viscus injury [5]

• Anticoagulants/antiplatelets: May worsen associated hemorrhage; assess need for reversal
• Antibiotics: Broad-spectrum coverage indicated for intraperitoneal rupture (risk of peritonitis/urosepsis); typically a fluoroquinolone or cephalosporin perioperatively
• Avoid nephrotoxic agents: Creatinine may be falsely elevated from urinary reabsorption — avoid unnecessary dose adjustments or dialysis before confirming true renal function [4]
• Anticholinergics/bladder relaxants: May mask urinary retention symptoms

• NPO if surgical repair anticipated
• No specific dietary triggers; however, alcohol binge drinking is a major associated factor for spontaneous rupture (11% of cases) due to bladder overdistension with impaired sensation [3][6]
• Post-repair: Adequate hydration to maintain catheter patency

• GU: Hematuria (gross or microscopic), dysuria, urinary retention, decreased output
• GI: Abdominal pain, distension, nausea/vomiting, ileus symptoms
• MSK: Pelvic/hip pain (associated pelvic fracture)
• Neuro: Perineal/saddle numbness (concomitant urethral or nerve injury)
• Constitutional: Fever, tachycardia (infection/sepsis)

• Witnesses to mechanism (especially in intoxicated patients)
• Pre-hospital fluid resuscitation and catheterization attempts
• No hereditary component, but relevant comorbidities include:
  • Prior pelvic radiation therapy (13% of spontaneous cases) [3]
  • Neurogenic bladder (diabetes, spinal cord injury)
  • Chronic bladder outlet obstruction (BPH, urethral stricture)
  • Bladder diverticula [7]
  • Prior bladder augmentation, neobladder, or continent reservoir [1]

• Pelvic fracture — 60–90% of extraperitoneal ruptures have associated pelvic fracture; 6–8% of pelvic fractures have bladder injury [2]
• Distended bladder at time of blunt force (seatbelt injury, assault) → intraperitoneal dome rupture [1]
• Alcohol intoxication — impaired voiding sensation + overdistension [3]
• Pelvic radiation — weakened bladder wall [3]
• Neurogenic bladder / chronic retention
• Bladder pathology: Diverticula, tumors, prior surgery, augmentation cystoplasty [1][7]
• Pediatric patients: More susceptible due to anatomy (bladder more abdominal than pelvic) [2]

• Renal injury (also presents with hematuria post-trauma)
• Ureteral injury (rare in blunt trauma; consider in deceleration injuries)
• Urethral injury (blood at meatus, high-riding prostate — must exclude before catheterization)
• Hollow viscus injury (bowel perforation — peritonitis, pneumoperitoneum)
• Intra-abdominal hemorrhage (solid organ injury — liver, spleen)
• Spontaneous bacterial peritonitis (in patients with ascites)
• Acute kidney injury (true vs. pseudo-AKI from urinary reabsorption — ascites/serum creatinine ratio >2 indicates urinary ascites) [4]
• Ruptured bladder diverticulum [7]

• Prior pelvic/bladder surgery or radiation
• Neurogenic bladder, BPH, urethral stricture
• Chronic urinary retention or catheterization history
• Bladder augmentation, neobladder, or continent reservoir (complex anatomy increases complication risk) [1]
• Coagulopathy or anticoagulant use
• Prior episodes of bladder rupture

• Vitals: Tachycardia, hypotension (hemorrhage or sepsis); fever (peritonitis)
• Abdomen: Suprapubic tenderness, distension, guarding, rebound (intraperitoneal rupture → peritonitis); diminished bowel sounds (ileus)
• Pelvis: Instability on compression (pelvic fracture); perineal ecchymosis
• GU: Blood at urethral meatus (urethral injury — do not catheterize until urethrogram performed); scrotal/perineal swelling (complex extraperitoneal extravasation)
• Rectal: High-riding prostate (urethral disruption); rectal injury
• Vaginal exam (if indicated): Assess for concomitant vaginal laceration [1]

• Urinalysis: Gross hematuria is the cardinal finding; microhematuria alone with low-risk pelvic fracture generally does not warrant cystography [1-2]
• BMP/CMP: Elevated creatinine and BUN (may be pseudo-AKI from peritoneal reabsorption); hyperkalemia, hyponatremia [4]
• CBC: Anemia from hemorrhage; leukocytosis (infection)
• Coagulation studies: PT/INR, PTT
• Type and screen/crossmatch: If significant hemorrhage or surgical repair anticipated
• Lactate: Assess for shock/sepsis
• Ascitic fluid analysis (if paracentesis performed): Ascites/serum creatinine ratio >2 is highly suggestive of urinary ascites [4]

The following figure illustrates the key imaging findings distinguishing intraperitoneal from extraperitoneal bladder rupture on CT and fluoroscopic cystography:

• Gold standard: Retrograde CT cystography — sensitivity 95%, specificity ~100% [1][9-10]
  • Requires active retrograde filling via Foley catheter with ≥300 mL diluted contrast; passive filling/delayed CT is inadequate (high false-negative rate) [2]
  • Intraperitoneal rupture: Contrast outlines bowel loops, fills paracolic gutters
  • Extraperitoneal rupture: Flame-shaped or "molar tooth" contrast extravasation confined to perivesical/pelvic space; may track to scrotum/perineum in complex injuries
• Fluoroscopic cystography: Similar sensitivity/specificity; used when CT unavailable [9]
• CT abdomen/pelvis with IV contrast (standard trauma CT): May show free fluid but cannot reliably diagnose bladder rupture without retrograde filling [2][11]
• Retrograde urethrogram (RUG): Must be performed before catheterization if urethral injury suspected [9]
• When imaging is unnecessary: Microhematuria alone without pelvic fracture or high-risk features [1][9]

• AAST Bladder Injury Grading Scale: [12]
  • Grade 1: Contusion or partial-thickness laceration
  • Grade 2: Extraperitoneal laceration <2 cm
  • Grade 3: Extraperitoneal >2 cm or intraperitoneal <2 cm
  • Grade 4: Intraperitoneal >2 cm
  • Grade 5: Laceration extending into bladder neck or ureteric orifice
• Ascites/serum creatinine ratio: >2 confirms urinary ascites (spontaneous rupture) [4]
• Intraoperative methylene blue or indigo carmine instillation: Useful to identify injury site during laparotomy [2]
• E-FAST: May detect free fluid but cannot differentiate urine from blood; low specificity for bladder injury

• ECG indicated if hyperkalemia is present (pseudo-AKI from urinary reabsorption can cause K⁺ >6.0 mmol/L) [4]
• Look for peaked T waves, widened QRS, sine wave pattern
• Also indicated in polytrauma patients for cardiac contusion screening

Bladder rupture is classified as extraperitoneal (most common, ~60–90% of traumatic cases, strongly associated with pelvic fractures) or intraperitoneal (~15–25% of traumatic cases, typically at the dome from sudden intravesical pressure rise). [1-2] Combined injuries occur in <5–12%. [2] Spontaneous rupture is rare but carries 15% mortality and is misdiagnosed in 64% of cases. [3] Key complications include urinary peritonitis, sepsis, pseudo-AKI, electrolyte derangements (hyperkalemia, hyponatremia), fistula formation, and abscess. [4][10]

Intraperitoneal rupture

• Operative repair is strongly recommended (strong recommendation per EAST, AUA, ACS, WSES-AAST) [1][10][13]
• Midline laparotomy; two-layer closure with absorbable 2-0 or 3-0 suture [1]
• Inspect for concomitant extraperitoneal injury via transvesical approach; inspect ureteral orifices [1]
• Place closed-suction pelvic drain; Foley catheter drainage postoperatively [1]
• 100% successful closure rate with operative repair [10]

Uncomplicated extraperitoneal rupture

• Nonoperative management with large-bore urethral catheter (≥18 Fr) drainage for minimum 7 days (typically 2–3 weeks) [1][10][13]
• Only 2.4% ultimately require operative intervention [10]
• Follow-up cystography to confirm healing before catheter removal [13]

Complicated extraperitoneal rupture (bladder neck injury, bone fragments in lumen, concomitant rectal/vaginal injury, pelvic hardware planned):

• Operative repair recommended[1][10]

Penetrating injuries: Generally require operative repair [1]

Spontaneous rupture: Surgical repair with evacuation of urinary ascites; electrolytes and creatinine normalize rapidly (within 48 hours) post-repair [4]

• Admit all confirmed bladder ruptures
• ICU if hemodynamically unstable, septic, or significant polytrauma
• OR urgently for intraperitoneal rupture, complicated extraperitoneal rupture, or penetrating injury [1][10]
• Floor/observation for uncomplicated extraperitoneal rupture managed with catheter drainage
• Urology consultation for all bladder injuries; trauma surgery if polytrauma
• Consider tertiary referral for patients with complex bladder anatomy (neobladder, augmentation cystoplasty) [1]

• Follow-up cystography at minimum 7 days post-repair (may extend to 3–4 weeks for complex injuries) to confirm healing before catheter removal [1]
• For nonoperative management: cystography at 7–14 days; if persistent leak, continue drainage and repeat; consider operative repair if not healed by 4 weeks [13]
• Return precautions: Fever, worsening abdominal pain/distension, decreased urine output, hematuria recurrence, signs of wound infection
• Expected recovery: Most uncomplicated injuries heal within 2–3 weeks; catheter removed after confirmed cystographic healing [13]
• Long-term: Monitor for urinary incontinence, recurrent UTI, or fistula formation in complex injuries

1. Best Practices Guidelines Management of Gentiunrinary Injuries. — Niels Johnsen, Hunter Wessells, Krystal Archer-Arroyo, et al American College of Surgeons (2025). 2025.

2. Kidney and Uro-Trauma: WSES-AAST Guidelines. — Coccolini F, Moore EE, Kluger Y, et al. World Journal of Emergency Surgery : WJES. 2019.

3. Spontaneous (Idiopathic) Rupture of the Urinary Bladder: A Systematic Review of Case Series and Reports. — Reddy D, Laher AE, Lawrentschuk N, Adam A. BJU International. 2023.

4. Spontaneous Bladder Rupture Induced Pseudo-Acute Kidney Injury: A Case Report and Literature Review. — Yu T, Cai C, Shi J, Jiang YJ. Medicine. 2025.

5. Intraperitoneal Urinary Bladder Rupture as a Cause of Pneumoperitoneum. — Parvez M D, Supreet K, Ajay S, Subodh K. The American Surgeon. 2023.

6. An Arterial Perihepatic Enhancement Caused by Spontaneous Bladder Rupture. — Harada T, Suyama Y, Hiratsuka Y, Shimizu T. Urology. 2017.

7. Spontaneous Rupture of Bladder Diverticulum With Pseudo Renal Failure:A Case Report and Literature Review. — Zhang Z, Shen J, He Q, Nie H. The American Journal of Emergency Medicine. 2024.

8. Bladder Injuries. — Yosuke Nakajima A Clinical Guide to Urologic Emergencies. 2021.

9. ACR Appropriateness Criteria® Minor Blunt Trauma. — Expert Panel on Polytrauma Imaging, Hoff CN, Hajibonabi F, et al. Journal of the American College of Radiology : JACR. 2026.

10. Management of Blunt Force Bladder Injuries: A Practice Management Guideline From the Eastern Association for the Surgery of Trauma. — Yeung LL, McDonald AA, Como JJ, et al. The Journal of Trauma and Acute Care Surgery. 2019.

11. ACR Appropriateness Criteria® Major Blunt Trauma. — Shyu JY, Khurana B, Soto JA, et al. Journal of the American College of Radiology : JACR. 2020.

12. ACR Appropriateness Criteria® Penetrating Trauma-Lower Abdomen and Pelvis. — Expert Panel on Urological Imaging, Heller MT, Oto A, et al. Journal of the American College of Radiology : JACR. 2019.

13. Urotrauma Guideline 2020: AUA Guideline. — Morey AF, Broghammer JA, Hollowell CMP, McKibben MJ, Souter L. The Journal of Urology. 2021.