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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
Honeycombing Most diseases ... on the basis of HRCT ... #Pulmonary #CTChest ... LowAttenuation #Differential ... #Diagram #Comparison
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
Upper lung zone ... Smoking related diseases ... (centrilobular emphysema ... #Pulmonary #HRCT ... #ChestCT #Differential
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
Differential diagnosis ... in interstitial lung ... disease comes from ... #Pulmonary #CXR ... #RadiologyAssistant
Cavities frequently arise within a mass or an area of consolidation as a result of necrosis.
We
the surrounding lung ... without associated pulmonary ... emphysema. ... #Clinical #Diagnosis ... #Comparison #RadiologyAssistant
Upper Lobe Lung Diseases - STAR CHASERS Mnemonic

S - Silicosis
T - Tuberculosis
A - Ankylosing Spondylitis
R -
caused by a rigid chest ... Pulmonary Diseases ... Centrilobular emphysema ... #diseases #differential ... #STARCHASERS #radiology
On the left a typical case of panlobular emphysema.
There is uniform destruction of the underlying architecture
the secondary pulmonary ... Pulmonary vessels ... difficult to detect on HRCT ... #Clinical #Radiology ... PanlobularEmphysema #RadiologyAssistant
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
resolution of the HRCT ... or interstitial lung ... #Pulmonary #CTChest ... #GroundGlass #Differential ... #RadiologyAssistant
There is a hydropneumothorax.
Notice the air-fluid level (blue arrow).
The upper lobe is still attached to the
attached to the chest ... disease. ... airways leading to pulmonary ... #Clinical #Radiology ... Lymphangioleiomyomatosis #LAM #RadiologyAssistant
Stage I - Redistribution
In a normal chest film with the patient standing erect, the pulmonary vessels
supplying the lung ... In daily clinical ... In these cases comparison ... #Clinical #Radiology ... Redistribution #RadiologyAssistant
The distribution of nodules shown on HRCT is the most important factor in making an accurate
distribution In certain diseases ... structures of the lung ... #Pulmonary #HRCT ... Perilymphatic #Comparison ... #Diagram #RadiologyAssistant