Diaphragmatic rupture

Diaphragmatic rupture often results from blunt abdominal trauma. The mechanism of injury is typically a motor-vehicle accident.

Given that the most common mechanism is motor vehicle collisions, it's perhaps unsurprising that young men are most frequently affected. Estimated incidence is ~4.5% (range 0.8-8%) of patients who sustain blunt abdominal or lower thoracic trauma 1-2; the most common herniated viscera are the stomach and colon.

The left hemidiaphragm is involved three times more frequently than the right, possibly because the liver has a buffering effect. Most ruptures are longer than 10 cm and occur at the posterolateral aspect of the left hemidiaphragm 4 between the lumbar and intercostal attachments, spreading radially.

It is rare to see rupture of the diaphragm without evidence of abdominal trauma, although this may be seen in the context of iatrogenic injury.

It is frequently not recognised at the time of trauma and the interval between injury and the onset of symptoms. However, if the diagnosis is not made in the first 4 hours, it may be undiagnosed for months or years. 

Specific diagnostic findings of diaphragmatic rupture on chest radiographs may not be seen in up to 50% of cases 1. However, the following signs are helpful in making the diagnosis:

  • inability to trace the normal hemidiaphragm contour
  • intrathoracic herniation of a hollow viscus (stomach, colon, small bowel) with or without focal constriction of the viscus at the site of the tear (collar sign)
  • if large, the positive mass effect may cause a contralateral mediastinal shift
  • visualisation of a nasogastric tube above the hemidiaphragm on the left side
  • left hemidiaphragm much higher than the right

Direct discontinuity of the hemidiaphragm may be seen with or without intrathoracic herniation of abdominal contents. The stomach and colon are the most common viscera to herniate on the left side and the liver is the most common viscus to herniate on the right side.

Other signs of diaphragmatic rupture includes:

  • the collar sign (or hourglass sign)  3: a waist-like constriction of the herniating hollow viscus from the abdominal into the chest at the site of the diaphragmatic tear, which is classical of diaphragmatic rupture
  • the dependent viscera sign: when a patient with a ruptured diaphragm lies supine at CT examination, the herniated viscera (bowel or solid organs) are no longer supported posteriorly by the injured diaphragm and fall to a dependent position against the posterior ribs
  • segmental non-recognition of the diaphragm
  • focal diaphragmatic thickening
  • thoracic fluid abutting the abdominal viscera

Indirect features include:

Imaging mimics of diaphragmatic injury include:

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Article information

rID: 12126
Systems: Chest, Trauma
Section: Gamuts
Synonyms or Alternate Spellings:
  • Rupture of diaphragm
  • Rupture of the diaphragm
  • Diaphragm rupture
  • Diaphragmatic injury
  • Diaphragmatic trauma
  • Diaphragm injury

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Cases and figures

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    Case 1: post-traumatic (with concurrent gastric volvulus) rupture-Intra-thoracic stomach herniation and gastric volvulus
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    Case 2
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    Traumatic diaphra...
    Case 3: traumatic diaphragmatic hernia
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    Case 4: small bowel in right chest
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    Case 5
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    Case 6: with hour glass sign on a Barium study
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    Case 13
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    Case 14: with CT
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    Case 16
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    Case 17: with peritoneal fat herniation
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    Case 18
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    Case 19: right sided diaphragmatic rupture
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