Pulmonary cyst

Pulmonary cysts are cystic spaces within the lung parenchyma that have a wall that measures between 1 and 4 mm. Lung cysts contain gas, not fluid.

The thickness of the wall is what distinguishes a cyst from a pulmonary cavity (that is defined as having a wall that is thicker than 4 mm).  A bleb or bulla has a wall that is less than 1 mm.

In contradistinction to all other organs, the term cyst as used in the lung, is a misnomer, as it refers to a contained focus of gas, not fluid.

Pulmonary cysts can be congenital or acquired. Multiple lung cysts in a child may be associated with an underlying process although this is rare, e.g. pleuropulmonary blastomas 1.

Share article

Article information

rID: 17899
System: Chest
Tag: cases, cases
Synonyms or Alternate Spellings:
  • Lung cyst
  • Lung cysts
  • Pulmonary cysts
  • Intrapulmonary cyst
  • Intrapulmonary cysts
  • Pulmonary parenchymal cyst
  • Pulmonary parenchymal cysts
  • Parenchymal cyst
  • Lung parenchymal cyst
  • Lung parenchymal cysts

Support Radiopaedia and see fewer ads

Cases and figures

  • Case 1
    Drag here to reorder.
  • Updating… Please wait.

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

     Thank you for updating your details.