Tree-in-Bud Sign

Definition

  • Definition: multiple areas of centrilobular nodules with a linear branching pattern

Etiology

BRONCHIOLAR TREE IN BUD


Physiology

Pathophysiologic Mechanisms (with Examples)

  • Bronchiectasis with Mucous Plugging
  • Bronchioles Filled with Pus
    • Aspiration Pneumonia/Diffuse Aspiration Bronchiolitis (see Aspiration Pneumonia, [[Aspiration Pneumonia]])
    • Tuberculosis (see xxxx, [[xxxx]])
  • Bronchiolitis: thickening of bronchiolar wall and bronchovascular bundle
    • Bronchiolitis (see Bronchiolitis, [[Bronchiolitis]]): especially infectious bronchiolitis
  • Bronchovascular Interstitial Infiltration
  • Infiltration of Small Pulmonary Arteries
  • Tumor Emboli to Centrilobular Arteries

References

  • xxxx