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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
cysts (LAM, LIP ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... LowAttenuation #Differential ... Emphysema #SignetRing #RadiologyAssistant
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
Upper lung zone ... bronchiolitis (RB-ILD ... edema #Diagnosis #Radiology ... #ChestCT #Differential ... #Upper #Lower #RadiologyAssistant
There is a hydropneumothorax.
Notice the air-fluid level (blue arrow).
The upper lobe is still attached to the
attached to the chest ... LAM is a rare lung ... airways leading to pulmonary ... #Clinical #Radiology ... #RadiologyAssistant
On the left a case with multiple cysts that are evenly distributed througout the lung (
througout the lung ... was a 40 year old ... #Clinical #Radiology ... #CTChest #LAM # ... #Pneumothorax #RadiologyAssistant
Septic emboli
Septic emboli usually present as multiple ill-defined nodules.
In about 50% cavitation is seen.
CT demonstrates more
densities iin the left lung ... , which are probably ... #Clinical #Radiology ... #CXR #CTChest # ... SepticEmboli #Cavity #RadiologyAssistant
Tree-in-bud
In centrilobular nodules the recognition of 'tree-in-bud' is of value for narrowing the differential diagnosis.
Tree-in-bud describes
narrowing the differential ... identified in the lung ... Diagnosis #Pathophys #Radiology ... #Pulmonary #CTChest ... TreeInBud #Diagram #RadiologyAssistant
Causes of Interstitial Lung Disease - Differential Diagnosis Algorithm
Idiopathic Interstitial Pneumonia
 • (UIP) Usual Interstitial Pneumonia
Disease - Differential ... Lymphangioleiomyomatosis (LAM ... ), • Pulmonary ... , Beomycin • Acute ... #Diseases #ILD
Here are the most common examples of these four patterns on a chest x-ray (click image
Here are the most ... patterns on a chest ... mass - Solitary Pulmonary ... Diagnosis #Clinical #Radiology ... Consolidation #Patterns #RadiologyAssistant
Perilymphatic distribution
Perilymphatic nodules are most commonly seen in sarcoidosis.
They also occur in silicosis, coal-worker's pneumoconiosis and
Perilymphatic nodules are ... #Diagnosis #Radiology ... #Pulmonary #HRCT ... #CTChest #Perilymphatic ... #RadiologyAssistant
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
these patterns are ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... IdiopathicInterstitialPneumonia #ILD ... #Findings #RadiologyAssistant