Approach to High Resolution CT
From Radipedia
Lung Nodules
Perilymphatic Nodules
- Distribution along pleura and interlobular septa
- Sarcoidosis
- Lymphangitic carcinomatosis
- Silicosis
- Amyloidosis
- LIP
Random Nodules
- May have pleural nodules
- Miliary TB
- Miliary fungal disease
- Hematogenous metastasis
Centrilobular Nodules
- Most peripheral nodule is 5-10 mm from pleura and fissure
- May mimic random pattern, but no pleural nodules
- Disease of small vessels or small airways
- Hypersensitivity pneumonitis
- Endobronchial spread of MAC or TB
- Bronchiolitis either infectious or inflammatory
- Endobronchial spread of BAC
- Pneumoconiosis
- COP
- LCH
- Pulmonary edema or vasculitis
- Bronchopneumonia
Tree in Bud
- Dilitation and impaction of centrilobular airways
- Centered 5-10 mm from pleural surface
- Most consistent with infection (viral, MAC, TB, etc)
- Bronchiectasis or bronchitis
- Cystic fibrosis with superimposed infection
- Aspiration
- ABPA
- BAC
