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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
Diagnosis #Radiology #Pulmonary ... LowAttenuation #Differential ... #Diagram #Comparison ... Emphysema #SignetRing #RadiologyAssistant
Syncope - Findings, Signs and Symptoms by Classification
 - Reflex Syncope 
 - Cardiogenic Syncope
Findings, Signs and ... #Syncope #Differential ... Classification #Table #CriticalCare ... Symptoms #Findings #Comparison
Central distribution is seen in sarcoidosis and cardiogenic pulmonary edema.
Peripheral distribution is mainly seen in cryptogenic
in sarcoidosis and ... cardiogenic pulmonary ... Diagnosis #Radiology #Pulmonary ... HRCT #ChestCT #Differential ... Central #Peripheral #RadiologyAssistant
Diffuse consolidation
The most common cause of diffuse consolidation is pulmonary edema due to heart failure.
This is
cardiogenic edema, to differentiate ... between cardiogenic and ... Kerley B-lines and ... Consolidation #Differential ... #RadiologyAssistant
Shock - Findings, Signs and Symptoms by Classification
 - Hypovolemic (Intravascular volume depletion)
 - Distributive (Vasodilation)
Findings, Signs and ... DrEricStrong #Shock #Differential ... Classification #Table #CriticalCare ... Symptoms #Findings #Comparison
Perilymphatic distribution
Perilymphatic nodules are most commonly seen in sarcoidosis.
They also occur in silicosis, coal-worker's pneumoconiosis and
pneumoconiosis and ... the overlap in differential ... Diagnosis #Radiology #Pulmonary ... Perilymphatic #Nodular #Differential ... #RadiologyAssistant
Differential diagnosis of Lymphangitic Carcinomatosis. 
On the left multiple diseases showing septal thickening:
1. Lymphangitic carcinomatosis: irregular
Differential diagnosis ... Cardiogenic pulmonary ... Carcinomatosis #Mimic #Differential ... #Comparison #Table ... #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
Diagnosis #Radiology #Pulmonary ... NodularPattern #Differential ... #Comparison #Table ... #RadiologyAssistant
Massive Hemoptysis - Differential Diagnosis Framework and Management
Definition: 150-600 mL over 24 hours
Differential Diagnosis:
 • Tracheobronchial:
Massive Hemoptysis - Differential ... Diagnosis Framework and ... Primary Vascular: Pulmonary ... Diagnosis #Management #pulmonary ... #criticalcare
Hilar and mediastinal lymphadenopathy
In sarcoidosis the common pattern is right paratracheal and bilateral hilar adenopathy ('1-2-3-sign').
In
Hilar and mediastinal ... lung carcinoma and ... Diagnosis #Radiology #Pulmonary ... Lymphadenopathy #Differential ... #RadiologyAssistant