Pneumothorax: detection with upright versus decubitus radiography

Area of Science:

• Radiology
• Diagnostic Imaging
• Thoracic Medicine

Background:

• Pneumothorax diagnosis can be challenging, especially for small air leaks.
• Decubitus chest radiography is sometimes used to improve visualization of pneumothorax.
• The comparative diagnostic value of upright versus decubitus chest radiography for pneumothorax needs further evaluation.

Purpose of the Study:

• To compare the diagnostic accuracy and radiologist confidence in detecting pneumothorax using expiratory upright chest radiographs versus expiratory lateral decubitus radiographs.
• To determine the optimal radiographic technique for evaluating small pneumothoraces.

Main Methods:

• A retrospective review of 19 sets of chest radiographs with pneumothoraces and 20 without.
• Five radiologists independently assessed the detectability of pneumothorax on both expiratory upright and expiratory lateral decubitus (suspected side up) views.
• Radiologists reported their accuracy and confidence levels for each radiographic view.

Main Results:

• Pneumothorax was detected 21% more often on expiratory upright radiographs (77/95 cases) compared to decubitus views (57/95 cases).
• Radiologists demonstrated significantly greater accuracy and confidence when interpreting the upright radiographic studies.
• In three specific instances, the decubitus positioning provided more definitive diagnostic information.

Conclusions:

• Expiratory upright chest radiography is generally superior to decubitus views for the clinical assessment of pneumothorax.
• Upright imaging offers higher detection rates and improved radiologist confidence, particularly for small pneumothoraces.
• Decubitus radiography may be considered in select cases where upright views are inconclusive.