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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Traction bronchiectasis
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Accession:HP:0032969 term browser browse the term
Definition:Distortion of the bronchial airways due to mechanical traction on the bronchi resulting from fibrosis of the surrounding lung parenchyma. CT findings represent irregular bronchial dilatation caused by surrounding retractile pulmonary fibrosis. Dilated airways are usually identifiable as such but may be seen as cysts.
Comment:The juxtaposition of numerous cystic airways may make the distinction from pure fibrotic honeycombing difficult. Also the differentation to peribronchovascular interstitial thickening can be difficult, but they can be distinguished on the basis of symptoms or pulmonary function abnormalities. In addition, patients with traction bronchiectasis have abnormal thick-walled and dilated bronchi that often appear much larger than the adjacent pulmonary artery branches, with a bronchoarterial ratio exceeding 1. This results in the appearance of an additional finding, the signet ring sign (HP:0032175).

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the respiratory system 0
        Abnormal respiratory system physiology 0
          Abnormal respiratory system morphology 0
            Abnormal tracheobronchial morphology 0
              Abnormal bronchus morphology 0
                Traction bronchiectasis 0
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