Horseshoe kidney rupture and infarction in trauma patient
This 20 year old male was assaulted in a side street. A CT IVP was performed 2 days later, after he passed 400mL of new hematuria.
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- Persistent extensive retroperitoneal / renal intracapsular hematoma is identified, with only minimal enlargement when compared to previous
- Contusion / infarction of the left renal lower pole possibly secondary to renovascular injury
- Small volume of excreted contrast extravasation near the inferior right renal pole raises the possibility of injury to the collecting system
- Small volume of free intraperitoneal fluid.
1 case question available
Horseshoe kidney is one of the most common congenital defects of the urogenital system, having an incidence of 0.25%1. It has an increased risk of trauma to the kidney due to its position anterior to the spinal column2.
In general, renal injury is caused by blunt injury, in particular, motor vehicle accidents and falls from height.
Traumatic renal injury can be graded from 1 though to 5. The grading system is defined as follows3:
- Grade I - Contusion or non-expanding subcapsular hematoma; No laceration
- Grade 2 - Non-expanding perirenal hematoma; Cortical laceration <1cm deep without extravasation
- Grade 3 - Cortical laceration > 1 cm without urinary extravasation
- Grade 4 - Laceration through corticomedullary junction into collecting system OR Vascular segmental renal artery or vein injury with contained hematoma
- Grade 5 - Shattered kidney OR renal pedicle injury or avulsion
Stable patients with grade 1 to 4 lacerations are managed conservatively. Grade 5 injuries, or unstable patients with lesser grade injuries require intervention. Unstable patients may have life-threatening hemorrhage, renal pedicle avulsion or expanding retroperitoneal hematomas.
Management options are either with open surgical exploration or interventional angioembolisation. Typically, nephrectomy is preferred over repair, unless there is a contraindicating factor such as a solitary kidney, or bilateral kidney injury.
This patient has a Grade 4 renal injury due to compromisation of the vascular segmental renal artery, causing hypodense renal parenchyma in the parenchymal phase.
Case contributed by A/Prof Pramit Phal.
- 1. Molina Escudero R, Cancho Gil MJ, Husillos Alonso A et-al. Traumatic rupture of horseshoe kidney. Urol. Int. 2012;88 (1): 112-4. doi:10.1159/000330800 - Pubmed citation
- 3. Lynch TH, Martínez-Piñeiro L, Plas E et-al. EAU guidelines on urological trauma. Eur. Urol. 2005;47 (1): 1-15. doi:10.1016/j.eururo.2004.07.028 - Pubmed citation
- 2. Daudia A, Hassan TB, Ramsay D. Trauma to a horseshoe kidney. J Accid Emerg Med. 1999;16 (6): 455-6. Free text at pubmed - Pubmed citation