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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 ... includes abnormalities ... low attenuation pattern ... #Diagnosis #Radiology ... #Pulmonary #CTChest
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
location of the abnormalities ... in ground glass pattern ... bronchiolitis #Diagnosis ... #Radiology #Pulmonary ... #GroundGlass #Differential
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
with a nodular pattern ... Respiratory bronchiolitis ... #Clinical #Diagnosis ... #Radiology #Pulmonary ... CTChest #Nodular #Pattern
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
High-Res Chest CT Patterns ... - Differential ... Hypersensitivity Pneumonitis, Respiratory ... HighRes #Chest #CT #Patterns ... Diagnosis #pulmonary
Abnormalities in Rate and Rhythm of Breathing 
Normal 
The respiratory rate is about 14—20 per min
Abnormalities in ... may show this pattern ... #Breathing #Patterns ... #Pulmonary #Abnormalities ... #Abnormal #Diagnosis
Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
Diagnosis Framework ... and renal abnormalities ... upper and lower respiratory ... - (C-ANCA) pattern ... - (P-ANCA) pattern
Causes of ST Segment Elevation - Differential Diagnosis Framework

STEMI:
 • Upsloping convex STE: "Pardee's sign" +
Diagnosis Framework ... Early-repolarization pattern ... Repolarization Abnormalities ... QRS complex Pulmonary ... leads • S1Q3T3 pattern
Vasculitis - Differential Diagnosis Framework

When to Consider Vasculitis:
• Purpura, ischemic skin lesions
• Mononeuritis multiplex
• Hematuria, proteinuria,
Vasculitis - Differential ... Diagnosis Framework ... and renal abnormalities ... white and gray matter ... upper and lower respiratory
Autoimmune Myositis - Differential Diagnosis Framework

Inflammatory Myopathies: Commonly symmetric proximal muscle weakness, no substantial muscle pain
Autoimmune Myositis - Differential ... • Weakness of respiratory ... slow onset and pattern ... Conduction system abnormalities ... #rheumatology #differential