Tree in bud
- The "tree-in-bud" pattern at thin-section computed tomography is characterized by small centrilobular nodules of soft-tissue attenuation connected to multiple branching linear structures of similar caliber originating from a single stalk.
- This pattern also resembles the small objects used in the childhood game of jacks.
- Initially described in cases of endobronchial spread of Mycobacterium tuberculosis.
- The "tree-in-bud" pattern has subsequently been reported as a manifestation of a variety of entities, including:
- Peripheral airway diseases such as infection (bacterial, fungal, viral, or parasitic)
- Congenital disorders
- Idiopathic disorders (obliterative bronchiolitis, panbronchiolitis)
- Immunologic disorders
- Connective tissue disorders
- Peripheral pulmonary vascular diseases (i.e. neoplastic pulmonary emboli).
 Imaging Findings
 See Also
 External Links
- Santiago Enrique Rossi, Tomas Franquet, Mariano Volpacchio, Ana Giménez, and Gabriel Aguilar. Tree-in-Bud Pattern at Thin-Section CT of the Lungs: Radiologic-Pathologic Overview. RadioGraphics 2005 25: 789-801.