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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
attenuation or air-filled ... Honeycombing Most diseases ... #Diagnosis #Radiology ... LowAttenuation #Differential ... #Diagram #Comparison
Shock - Differential Diagnosis Algorithm
Warm Extremities
 - Distributive Shock - Low JVP
Shock - Differential ... Extremities - Distributive ... Shock - Bibasilar Lung ... Left-sided Valvular Disease ... Decompensated Distributive
Batwing
A bilateral perihilar distribution of consolidation is also called a Batwing distribution.
The sparing of the periphery
periphery of the lung ... seen in chronic lung ... disease. ... #Diagnosis #Radiology ... #CXR #Batwing #Differential
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
Upper lung zone ... Smoking related diseases ... edema #Diagnosis #Radiology ... HRCT #ChestCT #Differential ... #Table #Distribution
CT Lung Signs in Pulmonary Diseases - One Page Summary of Pulmonary Signs
 - Air Crescent
CT Lung Signs in ... Pulmonary Diseases ... Pulmonary Signs - Air ... #diagnosis #differential ... #radiology
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
Differential diagnosis ... perilymphatic distribution ... Clinical #Diagnosis #Radiology ... Cystic #Cysts #Differential ... #Comparison #Table
Connective tissue disease-associated interstitial lung diseases

LIP: lymphoid interstitial pneumonia. NSIP: nonspecific interstitial pneumonia. OP: organizing pneumonia.
interstitial lung ... diseases LIP ... AIP: acute interstitial ... CTILD #Diagnosis #Differential ... #Comparison #Table
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
the result of air ... or interstitial lung ... Centrilobular distribution ... bronchiolitis #Diagnosis #Radiology ... #GroundGlass #Differential
The distribution of nodules shown on HRCT is the most important factor in making an accurate
The distribution ... In certain diseases ... structures of the lung ... #Diagnosis #Radiology ... Perilymphatic #Comparison
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
the left some diseases ... perilymphatic distribution ... Clinical #Diagnosis #Radiology ... NodularPattern #Differential ... #Comparison #Table