What radiologic finding in these images points to the diagnosis of traction bronchiectasis?

Signet ring sign

Visible airway within 1 cm from the pleura

Loss of tapering

Author’s solution
In the circles, a bronchus is identified that is larger than its parental and has a stable diameter while progressing peripherally.

The diagnosis of bronchiectasis is based on the following:
  • Loss of tapering
  • Signet ring sign (bronchial dilatation with respect to the accompanying pulmonary artery)
  • Visible airway within 1 cm of the pleura
Hansell DM et al. Radiology 2008;246:697-722.

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