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.
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.
- pulmonary cavity: wall thickness >2-4 mm 4-5
- bleb: wall thickness <1 mm at the lung surface
- bulla: wall thickness <1 mm
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