Low attenuation - Bronchiectasis

Bronchiectasis is defined as an abnormal, irreversible bronchial dilatation. It is often a result of prior infections, chronic bronchitis, COPD, asthma and cystic fibrosis.7,10

To distinguish the various causes of bronchiectasis during diagnosis, a combination of the following additional findings should be considered:

  • “Signet-ring sign” reflecting bronchial dilatation
  • Bronchial wall thickening
  • Lack of tapering
  • Mucus retention in the bronchial lumen
  • Air trapping
NB: Bronchiectasis must be discriminated from traction bronchiectasis, which is a result of fibrosis.
Low attenuation - Bronchiectasis