A 35-year-old woman is admitted to the trauma unit after a fall from a 15-foot scaffold. She reports left-sided flank pain and has a contusion over the left costovertebral angle. Vital signs are stable: BP 118/74 mmHg, HR 88/min. Urinalysis shows gross hematuria (>100 RBCs/hpf). Contrast-enhanced CT scan of the abdomen and pelvis reveals a Grade III renal laceration of the left kidney with contained perinephric hematoma and no active extravasation. There is no evidence of collecting system disruption or vascular injury. What is the most appropriate management?

Explanation

## Management of Blunt Renal Trauma — Grade III Laceration ### Renal Injury Grading (American Association for the Surgery of Trauma) | Grade | Injury Description | Imaging Findings | |-------|-------------------|------------------| | I | Contusion or minor laceration | Hematuria, no laceration on imaging | | II | Laceration <1 cm depth, no collecting system injury | Cortical laceration, contained hematoma | | III | Laceration >1 cm depth without collecting system injury | Deep laceration, perinephric hematoma, no extravasation | | IV | Laceration involving collecting system OR vascular injury | Urine extravasation OR renal artery/vein injury | | V | Shattered kidney OR renal artery/vein injury | Fragmentation OR vascular injury | **Key Point:** This patient has a **Grade III renal injury** — a deep laceration with contained perinephric hematoma but **no collecting system disruption and no active extravasation**. These are the hallmarks of an injury suitable for **non-operative management (NOM)**. ### Indications for Non-Operative Management of Renal Trauma 1. **Hemodynamic stability** (this patient: BP 118/74, HR 88) ✓ 2. **No peritoneal signs** (no mention of peritonitis) ✓ 3. **Contained hematoma** (perinephric, not extraperitoneal) ✓ 4. **No collecting system disruption** (confirmed on CT) ✓ 5. **No active extravasation** (confirmed on CT) ✓ 6. **Ability to monitor closely** (ICU/high-dependency unit available) ✓ ### Non-Operative Management Protocol ```mermaid flowchart TD A[Blunt renal trauma]:::outcome --> B{Hemodynamically<br/>stable?}:::decision B -->|No| C[Resuscitate + consider<br/>operative exploration]:::urgent B -->|Yes| D{Grade of injury<br/>on CT?}:::decision D -->|Grade I-III,<br/>no collecting system<br/>injury| E[Bed rest,<br/>analgesia,<br/>NPO initially]:::action D -->|Grade IV-V or<br/>collecting system<br/>injury| F[Operative exploration<br/>± nephrectomy]:::urgent E --> G[Serial clinical exams<br/>+ vitals monitoring]:::action G --> H{Deterioration?}:::decision H -->|Fever, pain,<br/>hemodynamic change| I[Repeat imaging<br/>± intervention]:::action H -->|Stable| J[Gradual mobilization<br/>after 48-72 hrs]:::action I --> K{Active bleeding<br/>or infection?}:::decision K -->|Yes| L[Angiographic embolization<br/>or nephrectomy]:::urgent K -->|No| J ``` ### Key Management Points **High-Yield:** The **vast majority** (>95%) of **Grade I–III renal injuries** in hemodynamically stable patients are managed **conservatively** without operative intervention. Nephrectomy is reserved for: - Hemodynamic instability unresponsive to resuscitation - Grade IV–V injuries (collecting system disruption, vascular injury) - Complications during observation (sepsis, uncontrolled bleeding) **Clinical Pearl:** **Bed rest** is the cornerstone of early management: - Keeps intra-renal pressure low - Reduces risk of hematoma expansion - Duration: typically 48–72 hours, then gradual mobilization if stable **Mnemonic:** **STABLE KIDNEY** = **S**table hemodynamics, **T**ained (contained) hematoma, **A**no collecting system injury, **B**lunt trauma, **L**ow-grade (I–III), **E**xpectant management, **K**eep in bed, **I**maging follow-up if deteriorates, **D**rain only if infected, **N**ephrectomy only if unstable, **E**arly mobilization if stable, **Y**ield to observation. ### Monitoring During Observation 1. **Vital signs:** Hourly for first 24 hours, then 4-hourly 2. **Abdominal examination:** Serial exams for peritonitis, flank tenderness 3. **Urine output:** Monitor for hematuria resolution (usually clears within 48 hours) 4. **Repeat imaging:** Only if clinical deterioration (fever, hemodynamic instability, increasing pain) 5. **Activity:** Bed rest for 48–72 hours, then gradual mobilization ### Why This Option Is Correct This patient meets **all criteria for non-operative management**: - Hemodynamically stable - Grade III injury (deep laceration but no collecting system disruption) - Contained perinephric hematoma - No active extravasation - No peritoneal signs Conservative management preserves renal function, avoids operative morbidity, and has excellent outcomes (>95% success rate) in appropriately selected patients.