sign is a description of certain CT scan
result. As the centrilobular bronchial dilatation and filling by mucus, pus or fluids looks like a budding tree, the pattern is called tree-in-bud.
The presence of tree-in-bud indicates lung diseases, especially bronchial disorders.
These lung diseases include:
- Congenital disorders: such as cystic fibrosis.
- Idiopathic disorders: obliterative bronchiolitis, diffuse panbronchiolitis, etc.
- Aspiration or inhalation of foreign substances.
- Immunologic disorders.
- Peripheral pulmonary vascular disease.
Of course, a tree-in-bud sign also suggests other conditions (for instance, rheumatoid arthritis).
Keywords: tree-in-bud; lung disease; bronchial disorder.