21 results
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
effusion; sometimes pneumothorax ... Centrilobular emphysema ... Clinical #Radiology #HRCT ... #CTChest #LowAttenuation ... Comparison #Table #RadiologyAssistant
The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
result in decreased lung ... - Lung cysts (LAM ... on the basis of HRCT ... Radiology #Pulmonary #CTChest ... #SignetRing #RadiologyAssistant
High Attenuation pattern 
1. Chronic eosinophilic pneumonia with peripheral areas of ground glass opacity.
2. Sarcoid end-stage
with peripheral areas ... end-stage with massive fibrosis ... Clinical #Radiology #HRCT ... #CTChest #HighAttenuation ... Comparison #Table #RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
Centrilobular emphysema ... low attenuation areas ... Clinical #Radiology #HRCT ... #CTChest #LowAttenuation ... Comparison #Table #RadiologyAssistant
Chronic hypersensitivity pneumonitis
The key findings in chronic hypersensitivity pneumonitis are:
Mosaic pattern with areas of ground-glass atenuation
atenuation and areas ... Fibrosis and parenchymal ... The HRCT shows a ... Radiology #CXR #CTChest ... #RadiologyAssistant
UIP with honeycombing (left) and chronic HP (right)
Differential diagnosis of Hypersensitivity Pneumonitis.
Subacute stage:
- RB-ILD: seen in
centrilobular emphysema ... show very similar HRCT ... throughout the whole lung ... Diagnosis #Radiology #CTChest ... #Mimic #ILD #RadiologyAssistant
On the left a typical case of panlobular emphysema.
There is uniform destruction of the underlying architecture
to widespread areas ... in the affected lung ... difficult to detect on HRCT ... Clinical #Radiology #CTChest ... 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 ... as seen in fibrosis ... or interstitial lung ... Radiology #Pulmonary #CTChest ... #Differential #RadiologyAssistant
Paraseptal emphysema is localized near fissures and pleura and is frequently associated with bullae formation (area
Paraseptal emphysema ... to spontaneous pneumothorax ... compression of adjacent lung ... Clinical #Radiology #CTChest ... ParaseptalEmphysema #RadiologyAssistant
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
responses of the lung ... combinations of fibrosis ... morphologic findings on HRCT ... Radiology #Pulmonary #CTChest ... ILD #Findings #RadiologyAssistant