Tree-in-bud opacities on thoracic CT Scan

Tree-in-bud opacities on thoracic CT Scan most commonly found in

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[A] Pulmonary aspergillosis
[B] Mycoplasma pneumonia
[C] Mycobacterium tuberculosis
[D] Mediastinal lymphadenopathy

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Tree-in-bud opacities on thoracic CT Scan

The tree portion represents the intralobular inflamed bronchiole, and the bud portion represents alveolar ducts filled with inflammatory
exudates

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Tree-in-bud opacities on thoracic CT Scan

• Most commonly caused by MTB

Other causes of ‘Tree-in-bud opacities’ on thoracic CT Scan

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Tree-in-bud opacities on thoracic CT Scan – can be CT manifestation of

• Endobronchial spread of various infections (bacterial, fungal, viral, or parasitic),
• Allergic bronchopulmonary aspergillosis,
• Congenital airway disorders like ciliary dyskinesia or cystic fibrosis,
• Idiopathic disorders (obliterative bronchiolitis, panbronchiolitis),
• Aspiration or inhalation of foreign substances,
• Immunologic disorders,
• Connective tissue disorders
• Peripheral pulmonary vascular diseases such as pulmonary tumor emboli.

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