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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 ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... Differential #Diagram #Comparison ... Emphysema #SignetRing #RadiologyAssistant
On the left another patient with alveolar edema at admission, which resolved after treatment.
When you scroll
#Clinical #Radiology ... #CXR #CHF #Alveolar ... #Pulmonary #Edema ... #AlveolarEdema ... #RadiologyAssistant
Hilar and mediastinal lymphadenopathy
In sarcoidosis the common pattern is right paratracheal and bilateral hilar adenopathy ('1-2-3-sign').
In
sarcoidosis the common pattern ... adenopathy ('1-2-3-sign ... #Diagnosis #Radiology ... #Pulmonary #Mediastinal ... #Differential #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
with a nodular pattern ... Clinical #Diagnosis #Radiology ... #Pulmonary #CTChest ... #Differential #Comparison ... #Table #RadiologyAssistant
Notice that even within each lobe there is a gravity dependent difference in density.
This is only
#Clinical #Radiology ... #CTChest #CHF # ... Alveolar #Pulmonary ... #Edema #AlveolarEdema ... Gravity #Dependent #RadiologyAssistant
On the left a patient with CHF. 
There is an increase in heart size compared to
Other signs of CHF ... redistribution of pulmonary ... that helpful, but comparison ... #Clinical #Radiology ... #Comparison #RadiologyAssistant
Stage I - Redistribution
In a normal chest film with the patient standing erect, the pulmonary vessels
In these cases comparison ... during a period of CHF ... #Clinical #Radiology ... #CXR #CHF #Cephalization ... Redistribution #RadiologyAssistant
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
on the left in order ... have specific patterns ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... ILD #Findings #RadiologyAssistant
The distribution of nodules shown on HRCT is the most important factor in making an accurate
in the nodular pattern ... #Diagnosis #Radiology ... #Pulmonary #HRCT ... Perilymphatic #Comparison ... #Diagram #RadiologyAssistant
Reticular pattern 
1. Lymphangitic carcinomatosis: irregular septal thickening, usually focal or unilateral 50% adenopathy', known carcinoma.
2.
Reticular pattern ... Cardiogenic pulmonary ... #Clinical #Radiology ... #Comparison #Table ... #RadiologyAssistant