Paraseptal emphysema

Paraseptal emphysema refers to a morphological subtype of pulmonary emphysema located adjacent to the pleura and septal lines with a peripheral distribution within the secondary pulmonary lobule. The affected lobules are almost always subpleural, and demonstrate small focal lucencies up to 10 mm in size.

The patient is usually asymptomatic, but the condition is considered to be a cause of pneumothorax in young adults.

Paraseptal emphysema is usually limited in extent occurring most commonly along the dorsal surface of the upper lung, and is often associated with fibrosis and may coexist with other types of emphysema.

Any larger than 10 mm and they are referred to as subpleural blebs or subpleural bullae.

Share article

Article information

rID: 17877
System: Chest
Tag: refs
Synonyms or Alternate Spellings:
  • Paraseptal emphysematous change
  • Distal acinar emphysema
  • Para-septal emphysema

Support Radiopaedia and see fewer ads

Cases and figures

  • Drag
    Figure 1: paraseptal emphysema illustration
    Drag here to reorder.
  • Drag
    Case 2
    Drag here to reorder.
  • Drag
    Case 3: with concurrent subpleural bullae
    Drag here to reorder.
  • Drag
    Case 4
    Drag here to reorder.
  • Drag
    Case 5
    Drag here to reorder.
  • Updating… Please wait.
    Loadinganimation

    Alert accept

    Error Unable to process the form. Check for errors and try again.

    Alert accept Thank you for updating your details.