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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 ... LowAttenuation #Differential ... Emphysema #SignetRing #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
Differential diagnosis ... histiocytosis or honeycombing ... seen and in many cases ... #Diagnosis #Radiology ... RadiologyAssistant
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
Low Attenuation pattern ... Honeycombing 4. ... #Clinical #Radiology ... LowAttenuation #Cystic #Pattern ... Comparison #Table #RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
Low Attenuation pattern ... Honeycombing. 4. ... #Clinical #Radiology ... LowAttenuation #Cystic #Pattern ... Comparison #Table #RadiologyAssistant
UIP
UIP is a histologic pattern of pulmonary fibrosis.
On a chest X-ray UIP manifests as a reticular
In many cases you ... demonstrating honeycombing ... #Clinical #Radiology ... #Honeycombing # ... RadiologyAssistant
The CXR demonstrates a reticular interstitial pattern with a preference at the lung bases.
The HRCT demonstrates
preference at the lung bases ... #Clinical #Radiology ... #Interstitial #Pattern ... #Honeycombing # ... TractionBronchiectasis #RadiologyAssistant
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
High-Res Chest CT Patterns ... - Differential ... Silicosis • Honeycombing ... #Differential # ... Diagnosis #pulmonary #radiology
Sarcoidosis
In this case the chest x-ray shows subtle findings that could be described as fine reticulation.
In
Sarcoidosis In this case ... In many cases a ... #Clinical #Radiology ... #Interstitial #Pattern ... #RadiologyAssistant
Honeycombing is defined by the presence of small cystic spaces with irregularly thickened walls composed of
Honeycombing is ... regardless of their cause ... #Diagnosis #Radiology ... #Differential # ... RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
with a nodular pattern ... before the typical cysts ... Clinical #Diagnosis #Radiology ... NodularPattern #Differential ... Comparison #Table #RadiologyAssistant