Subpulmonic pneumothorax in patients with chronic obstructive pulmonary disease

Area of Science:

• Pulmonology
• Radiology
• Thoracic Medicine

Background:

• Spontaneous pneumothorax can occur in patients with chronic obstructive pulmonary disease (COPD).
• Subpulmonic air trapping by adhesions is a rare cause of pneumothorax.
• Extensive parenchymal scarring, particularly from tuberculosis, may predispose to this condition.

Observation:

• Four patients with severe COPD and significant parenchymal scarring presented with subpulmonic pneumothorax.
• These patients exhibited respiratory failure without classic pneumothorax symptoms.
• The condition was identified on upright chest radiographs due to pleural air trapping.

Findings:

• Subpulmonic pneumothorax is associated with severe COPD and prior lung scarring.
• Clinical presentation can be atypical, mimicking other causes of respiratory distress.
• Radiographic detection relies on recognizing air beneath the diaphragm due to adhesions.

Implications:

• Radiologists must consider subpulmonic pneumothorax in patients with COPD and lung scarring presenting with respiratory failure.
• This diagnosis is critical due to the potentially lethal nature of the condition.
• Awareness can lead to timely diagnosis and management, improving patient outcomes.