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Lung Nodules - Differential Diagnosis by Distribution
 • Centrilobular: Hypersensitivity Pneumonitis, RB-ILD, Pneumoconiosis, Infectious Bronchiolitis, Vasculitis,
Lung Nodules - Differential ... Distribution • Centrilobular ... BrighamChiefs #Lung
Centrilobular emphysema due to smoking. The periphery of the lung is spared (blue arrows). Centrilobular artery
Centrilobular emphysema ... periphery of the lung ... Centrilobular artery ... Radiology #CTChest #Centrilobular
Tree-in-bud
In centrilobular nodules the recognition of 'tree-in-bud' is of value for narrowing the differential diagnosis.
Tree-in-bud describes
Tree-in-bud In centrilobular ... identified in the lung ... or pus-filled) centrilobular
The distribution of nodules shown on HRCT is the most important factor in making an accurate
perilymphatic, centrilobular ... Centrilobular distribution ... limited to the centrilobular ... random nodules, centrilobular ... structures of the lung
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
Upper lung zone ... related diseases (centrilobular
Subacute hypersensitivity pneumonitis
The key findings in the subacute hypersensitivity pneumonitis are:
ill-defined centrilobular nodules of ground-glass opacity
are: ill-defined centrilobular ... opacity due to lung ... are ill-defined centrilobular ... Nodular #Subacute #Centrilobular
Tree-in-Bud Sign on Chest CT
 • Multiple centrilobular nodules arranged in a linear branching pattern.
 •
CT • Multiple centrilobular ... TreeInBud #Sign #CT #Lung
Metastases
Metastases are the most common cause of multiple pulmonary masses.
Usually they vary in size and are
perilymphatic or centrilobular ... disease to the lungs ... CXR #LungMets #Lung
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
or interstitial lung ... , NSIP, DIP. - Centrilobular
Upper Lobe Lung Diseases - STAR CHASERS Mnemonic

S - Silicosis
T - Tuberculosis
A - Ankylosing Spondylitis
R -
Upper Lobe Lung ... Etiology: Lung ... apices of the lung ... CO2 & pH in the lung ... inhalation - Centrilobular