Lower rib fractures and renal laceration in multitrauma

Case contributed by Dr Dayu Gai

Presentation

This 41 year male was involved in a truck rollover accident in a rural area. He was intubated and transferred to a tertiary trauma centre. A CT trauma series was performed.

Patient Data

Age: 40
Gender: Male
  1. Right 8th -11th displaced rib fractures. Nasogastric tube and right subclavian line in situ. No evidence of mediastinal haematoma, pericardial effusion or aortic injury.
  2. Large right pneumothorax present with associated atelectasis. Right intercostal catheter in situ.
  1. Right kidney upper pole laceration with surrounding haematoma. Small amount of haematoma around the right adrenal gland.
  2. The liver is enlarged and hypodense, consistent with fatty infiltration. Small amount of haematoma is seen around the inferior tip of the liver.
  3. Further blood is seen in the retroperitoneum, around the second and third parts of the duodenum. This raises the possibility of a duodenal injury.
  4. No evidence of left kidney, adrenal or pancreatic injury.
  5. Vicarious excretion of the contrast to the gall bladder. 

Case Discussion

Rib fractures are a common traumatic occurrence, where the 4th to 9th ribs are most commonly fractured. Superior rib fractures of the 1st to 3rd ribs are more commonly associated with subclavian vasculature as well as brachial plexus injury. More inferior rib fractures of the 10th to 12th ribs are associated with visceral injury, in particular, the spleen, kidney and liver1. In general, the greater the number of fractured ribs, the more severe the causative injury.

Rib fractures can have multiple complications. These include:

  1. Pneumothorax
  2. Haemothorax
  3. Pulmonary contusions
  4. Flail chest
  5. Pneumonia
  6. Atelectasis

Traumatic renal injury is a relatively uncommon occurrence, which is found in 1-5% of all traumas2. They are typically caused by blunt injury mechanisms, 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 haematoma; No laceration
  • Grade 2 - Non-expanding perirenal haematoma; 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 haematoma
  • Grade 5 - Shattered kidney OR renal pedicle injury or avulsion

Stable patients with grade 1 to 4 lacerations tend to be managed conservatively. Grade 5 injuries, or unstable patients with lesser grade injuries require intervention. Unstable patients may have life-threatening haemorrhage, renal pedicle avulsion or expanding retroperitoneal haematomas.

Management options are either with open surgical exploration or interventional angioembolisation. Nephrectomy is usually preferred over repair for severe lacerations, unless there is a contra-indicating factor such as a solitary kidney or bilateral kidney injury.

This patient's lower rib fractures are most likely the cause of his right kidney laceration. Note the surrounding hypodensity representing active renal artery haemorrhage. Blunt trauma is most often the cause of kidney injury, in particular deceleration injuries from motor vehicle accidents.

Case contributed by A/Prof. Pramit Phal.

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Case information

rID: 30838
Case created: 6th Sep 2014
Last edited: 31st Jul 2016
Inclusion in quiz mode: Included

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