Small airways disease

Last revised by Yuranga Weerakkody on 23 Jan 2023

Small airways disease comprise of a group infectious as well as non-infectious conditions that affect the small airways (i.e. airways that are more peripheral to the main bronchi and proximal bronchioles (4th the 14th generation) - arbitrarily considered to be those with an internal diameter of ≤2 mm 3).


While some authors consider this term synonymous with a bronchiolitis 4, conditions such as asthma may also fall under this group 7. There are also many other conditions that can affect or be associated with small airways which include:

Radiographic features


There are many CT features associated with small airways disease, which include:

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