Subcutaneous Emphysema
Air trapped in the soft tissues that may appear as streaky lucency over the chest wall or neck
Subcutaneous emphysema means air is present in soft tissues outside the lung and may appear as streaky or bubbly lucency over the chest wall, neck, or shoulders.
Subcutaneous emphysema means air has leaked into soft tissues under the skin. It often feels crackly on examination and can occur with pneumothorax, trauma, chest procedures, or air leak from the lungs or airway.
Representative X-ray
Representative annotated X-ray not available for this topic yet.
We only show a representative image when there is a clean corresponding source in the current reference set.
What it is
- This is a descriptive imaging finding of soft-tissue air
- It does not by itself identify the cause, but it can be a clue to an underlying lung, pleural, tracheal, esophageal, or traumatic process
How it appears on chest X-ray
- On X-ray, subcutaneous emphysema appears as linear, streaky, or bubbly lucency outlining muscle planes and soft tissues of the chest wall, neck, or upper abdomen
What radiologists look for
- Radiologists look for the distribution of soft-tissue air and for associated causes such as pneumothorax, pneumomediastinum, rib fracture, procedure-related changes, or traumatic injury
How X-ray helps
- X-ray helps confirm soft-tissue air and prompts a search for the source, especially pneumothorax or mediastinal air
Common causes
- Causes include pneumothorax, pneumomediastinum, trauma, rib fractures, chest tube placement, surgery, mechanical ventilation, infection, and airway or esophageal injury
Symptoms / associated symptoms
- Symptoms vary with the underlying cause
- Some patients notice swelling or crackling under the skin, while others present with chest pain, trauma, breathing symptoms, or postoperative findings
Risk factors
- Risk factors depend on the cause and may include trauma, thoracic procedures, barotrauma, severe cough, surgery, and invasive ventilation
Why it can matter clinically
- The soft-tissue air itself may resolve, but associated injuries can be serious and may involve respiratory compromise or progressive air leak
When to seek medical care
- Prompt evaluation is important after chest trauma, sudden swelling with crackling skin, breathing difficulty, or severe chest symptoms
Evaluation and diagnosis
- Evaluation may include repeat imaging, CT, trauma assessment, airway review, and management of any associated pneumothorax or injury
Treatment approaches
- Treatment focuses on the source of the air leak
- Some cases are observed, while others need drainage, procedure-related correction, trauma care, or surgical evaluation
Medication classes clinicians may use
Management is cause-specific; there is no single medication that treats soft-tissue air itself.
Treatment modalities commonly paired with medication decisions
- Observation when appropriate
- Treatment of underlying air leak
- Chest drainage in selected cases
- Trauma or surgical management when indicated
Analgesics
Used when pain from trauma or air-leak-related chest symptoms needs support.
- acetaminophen
- ibuprofen
FAQ
Is subcutaneous emphysema dangerous?
The air under the skin may not be the main danger, but it can signal a more important underlying injury such as pneumothorax, trauma, or airway damage.
Can it happen after a chest procedure?
Yes. It can appear after surgery, chest tubes, biopsies, or other thoracic procedures if air tracks into soft tissues.