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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
decreased lung attenuation ... diseases with a low attenuation ... Diagnosis #Radiology #Pulmonary
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
Honeycombing - See Low Attenuation ... Bronchopneumonia High Attenuation ... Water, Tumor Low Attenuation ... Honeycombing: Idiopathic Pulmonary ... Differential #Diagnosis #pulmonary
Mosaic Attenuation on Chest CT
 • Variable attenuation seen on a chest CT in a lobular
Mosaic Attenuation ... CT • Variable attenuation ... .2016.12.033 #Mosaic #Attenuation ... #CT #Lung #Pulmonary
CT Lung Signs in Pulmonary Diseases - One Page Summary of Pulmonary Signs
 - Air Crescent
Lung Signs in Pulmonary ... Page Summary of Pulmonary ... sign - Mosaic attenuation ... #Lung #Signs #Pulmonary
Mosaic attenuation
The term 'mosaic attenuation' is used to describe density differences between affected and non-affected lung
Mosaic attenuation ... The term 'mosaic attenuation ... presents as mosaic attenuation ... Diagnosis #Radiology #Pulmonary ... MosaicAttenuation #Mosaic #Attenuation
Differential diagnosis of Lymphangitic Carcinomatosis. 
On the left multiple diseases showing septal thickening:
1. Lymphangitic carcinomatosis: irregular
Cardiogenic pulmonary ... with ground glass attenuation ... Cardiogenic pulmonary ... Clinical #Radiology #Pulmonary
Basic Interpretation
A structured approach to interpretation of HRCT involves the following questions:
What is the dominant HR-pattern:
reticular
nodular
high
reticular nodular high attenuation ... consolidation) low attenuation ... Diagnosis #Radiology #Pulmonary
Head Cheese Sign on Chest CT
 • Juxtaposition of distinct radiographic areas of low, normal and
normal and high attenuation ... Sign #CT #Lung #Pulmonary
Bronchiectasis - Summary

What?
• Bronchiectasis is derived from the Greek words bronckos meaning airway and ectasis meaning
stigmata of cor pulmonale ... • Pulmonary artery ... hypertension • Mosaic attenuation ... Acid fast) • Pulmonary ... Bronchiectasis #pulmonary
Reticular pattern 
1. Lymphangitic carcinomatosis: irregular septal thickening, usually focal or unilateral 50% adenopathy', known carcinoma.
2.
Cardiogenic pulmonary ... : ground glass attenuation ... Cardiogenic pulmonary