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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
Emphysema - Lung cysts ... Diagnosis #Radiology #Pulmonary ... #CTChest #LowAttenuation ... TractionBronchiectasis #Cysts ... Emphysema #SignetRing #RadiologyAssistant
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
(LAM): uniform cysts ... bizarre shaped cysts ... HRCT #CTChest #LowAttenuation ... Pattern #Comparison #Table ... #RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
multiple thick walled cysts ... (LAM): regular cysts ... HRCT #CTChest #LowAttenuation ... Pattern #Comparison #Table ... #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
low attenuation (table ... appreciate on a cest ... When the cysts have ... Diagnosis #Radiology #Pulmonary ... #Differential #RadiologyAssistant
Radiologists use many terms to describe areas of decreased density or lucencies within the lung, like
the lung, like cyst ... describe a chest X-ray ... a thick wall Cyst ... #Differential #Table ... #Lung #Pulmonary
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
before the typical cysts ... Diagnosis #Radiology #Pulmonary ... Differential #Comparison #Table ... #RadiologyAssistant
Pericardial cyst
Pericardial cysts are connected to the pericardium and usually contain clear fluid.
The majority of pericardial
Pericardial cyst ... Pericardial cysts ... proximal aorta and pulmonary ... On the chest x-ray ... #RadiologyAssistant
The table on the left is the overall table for mediastinal masses.
In the next paragraphs we
The table on the ... Tumors - Benign Cysts ... tumors - Foregut cysts ... masses #Diagnosis #Pulmonary ... Middle #Posterior #RadiologyAssistant
Cystic lung disease
Lung cysts are defined as radiolucent areas with a wall thickness of less than
lung disease Lung cysts ... listed in the table ... Diagnosis #Radiology #Pulmonary ... #Differential #RadiologyAssistant