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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
- Lung cysts (LAM ... histiocytosis) - Bronchiectasis ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... #RadiologyAssistant
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
Cystic LCH: - LAM ... bronchiectasis: ... Clinical #Diagnosis #Radiology ... #CTChest #Cystic ... #Comparison #Table
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
Lymphangiomyomatosis (LAM ... Honeycombing 4. ... #Clinical #Radiology ... #HRCT #CTChest ... #Pattern #Comparison
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
Centrilobular emphysema ... Honeycombing. 4. ... #Clinical #Radiology ... #HRCT #CTChest ... #Pattern #Comparison
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
Lymphangitic Carcinoma, Interstitial ... Attenuation: • Emphysema ... Lymphocytic Int PNA, Lymphangioleiomyomatosis ... Sarcoidosis • Bronchiectasis ... #radiology
High Attenuation pattern (2) 
1. Non specific interstitial pneumonitis (NSIP): ground glass with traction bronchiectasis, no
Non specific interstitial ... with traction bronchiectasis ... , no honeycombing ... #Clinical #Radiology ... #HRCT #CTChest
The case on the left shows subpleural honeycomb cysts in several contiguous layers.
There is also a
subpleural honeycomb cysts ... Pneumonia (UIP) ... #Clinical #Radiology ... #CTChest #UIP # ... #Honeycombing #
Cavities frequently arise within a mass or an area of consolidation as a result of necrosis.
We
associated pulmonary ... Clinical #Diagnosis #Radiology ... #CTChest #Cavity ... #Cyst #Emphysema ... #Comparison #RadiologyAssistant
Basic Interpretation
A structured approach to interpretation of HRCT involves the following questions:
What is the dominant HR-pattern:
reticular
nodular
high
, cystic) Where ... ) #Diagnosis #Radiology ... #Pulmonary #HRCT ... #Algorithm #ILD ... #RadiologyAssistant