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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
The fourth pattern ... low attenuation pattern ... Diagnosis #Radiology #Pulmonary ... Differential #Diagram #Comparison ... Emphysema #SignetRing #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
with a nodular pattern ... Diagnosis #Radiology #Pulmonary ... CTChest #Nodular #Pattern ... #Differential #Comparison ... #Table #RadiologyAssistant
Stage I - Redistribution
In a normal chest film with the patient standing erect, the pulmonary vessels
The pulmonary vascular ... In these cases comparison ... during a period of CHF ... Radiology #CXR #CHF ... Redistribution #RadiologyAssistant
The distribution of nodules shown on HRCT is the most important factor in making an accurate
in the nodular pattern ... Diagnosis #Radiology #Pulmonary ... NodularPattern #Nodular #Pattern ... Perilymphatic #Comparison ... #Diagram #RadiologyAssistant
On the left a patient with CHF. 
There is an increase in heart size compared to
a patient with CHF ... redistribution of pulmonary ... that helpful, but comparison ... #Exacerbation #Comparison ... #RadiologyAssistant
Basic Interpretation
A structured approach to interpretation of HRCT involves the following questions:
What is the dominant HR-pattern:
reticular
nodular
high
Basic Interpretation ... structured approach to interpretation ... the dominant HR-pattern ... Diagnosis #Radiology #Pulmonary ... Algorithm #ILD #RadiologyAssistant
There are three principal varieties of pulmonary edema: cardiac, overhydration and increased capillary permeability (ARDS). 
The
principal varieties of pulmonary ... different forms of pulmonary ... Radiology #CXR #CHF ... Pedicle #Width #Comparison ... VascularPedicleWidth #RadiologyAssistant
Reticular pattern 
1. Lymphangitic carcinomatosis: irregular septal thickening, usually focal or unilateral 50% adenopathy', known carcinoma.
2.
Reticular pattern ... Cardiogenic pulmonary ... Cardiogenic pulmonary ... #Comparison #Table ... #RadiologyAssistant
On the left a smoker with RB-ILD with subtle HRCT-findings.
The dominant pattern is ground glass opacification.
Additional
The dominant pattern ... mandatory for the interpretion ... probably would be pulmonary ... would expect more pulmonary ... RespiratoryBronchiolitis #ILD #RadiologyAssistant