Chest trauma imaging: ribs, contusion, haemothorax and the aorta
- Finding
After a chest injury, a quick X-ray and bedside ultrasound look for problems that kill fast; a CT then finds the hidden injuries in stable patients.
What it is
In chest trauma, imaging follows the primary survey. A supine chest X-ray and an eFAST at the bedside look for the immediate threats: pneumothorax, haemothorax, a widened mediastinum and the position of tubes. Tension pneumothorax and massive bleeding are treated on clinical grounds, not after a scan. In the stable patient with significant mechanism, CT of the chest with intravenous contrast is the reference study: it shows rib and spine fractures, pulmonary contusion and laceration, small pneumothoraces and haemothoraces missed on the supine film, and injuries of the aorta and great vessels. A normal chest X-ray does not exclude an aortic injury.
What it looks like
- Supine film: pneumothorax gives a deep, dark costophrenic angle (deep sulcus); blood gives a hazy veil over the whole hemithorax with vessels still seen through it.
- Flail chest: three or more adjacent ribs each broken in two or more places; usually with underlying contusion.
- Fractures of the first to third ribs, the scapula or the sternum mean high-energy trauma; look for vessel and nerve injuries.
- Lower rib fractures (9 to 12) raise suspicion of liver, spleen or kidney injury.
- Contusion: patchy, non-segmental opacities that do not follow lobes, appear within hours and clear in about a week.
- Aortic injury signs: widened mediastinum, lost aortic knob, trachea or nasogastric tube pushed to the right, depressed left main bronchus, left apical cap.
Why it looks that way
- Blunt force bruises the lung: blood and fluid leak into alveoli and interstitium, so the opacity crosses lobar boundaries.
- On a supine film, pleural fluid layers behind the lung instead of forming a meniscus, and air rises to the front and base of the chest.
- Sudden deceleration tears the aorta where it is fixed, most often at the isthmus just after the left subclavian artery; the mediastinal haematoma widens the mediastinum.
Differential and pitfalls
- Many rib fractures, especially anterior and cartilage fractures, are invisible on the chest X-ray; the X-ray is mainly for their complications.
- A supine AP film magnifies the mediastinum; judge widening with care and compare with the clinical picture.
- Contusion that worsens after the first days suggests pneumonia or ARDS, not the bruise itself.
- A pneumothorax that persists despite a working drain, or a lung that falls away from the hilum, suggests a bronchial tear.
- Left diaphragmatic rupture is easily missed: an irregular or raised left hemidiaphragm or a nasogastric tube curling above it.
- On CT, fresh blood measures denser than simple fluid; contrast leaking into the pleural space means active bleeding.
Next step
- Unstable patient: treat tension pneumothorax or massive haemothorax clinically; use supine chest X-ray and eFAST at the bedside, and call the trauma team.
- Stable with significant mechanism: CT of the chest (and abdomen as needed) with intravenous contrast.
- Widened mediastinum or high-energy deceleration: CT angiography of the aorta, even if the X-ray looks normal; involve vascular or thoracic surgery.
- Haemothorax: chest drain and record the output; ongoing bleeding or a contrast blush: call thoracic surgery.
- After a drain or in isolated rib fractures: repeat chest X-ray for lung re-expansion, drain position and delayed effusion or pneumothorax.
Test yourself
Think of the answer, then tap the question to see it.
What is a flail chest?
Three or more adjacent ribs each fractured in two or more places, so a segment of chest wall moves paradoxically; it usually comes with an underlying pulmonary contusion.
How does a haemothorax look on a supine chest X-ray?
As a hazy veil over the whole hemithorax with lung vessels still visible through it, without a meniscus, because the blood layers behind the lung.
How is a pulmonary contusion told apart from pneumonia on imaging?
Contusion appears within hours of injury, does not follow lobes or segments and clears in about a week; an opacity that appears or worsens after several days suggests pneumonia.
Which chest X-ray signs suggest traumatic aortic injury?
A widened mediastinum, loss of the aortic knob contour, the trachea or nasogastric tube pushed right, a depressed left main bronchus and a left apical cap.
Elsewhere in DurgiPedia
Connections
Educational content; it does not replace a radiologist's report and is not a clinical instruction. Each study is ordered on the patient's assessment and your institution's protocols.
Sources: Thoracic Trauma (StatPearls (NCBI Bookshelf), 2026); Rib Fracture (StatPearls (NCBI Bookshelf), 2023); Pulmonary Contusion (StatPearls (NCBI Bookshelf), 2024); Hemothorax (StatPearls (NCBI Bookshelf), 2023); Widened Mediastinum (StatPearls (NCBI Bookshelf), 2023).
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Representative model, for educational purposes only.