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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
Honeycombing Most diseases ... Diagnosis #Radiology #Pulmonary ... #CTChest #LowAttenuation ... Differential #Diagram #Comparison ... Emphysema #SignetRing #RadiologyAssistant
Approach to the A-a Gradient
A-a gradient = PAO2 - PaO2
A-a gradient = [FiO2 x (Patm -
Hypoventilation: CNS ... Embolism, Obstructive Lung ... Disease, Interstitial ... Disease and more ... , Interstitial Lung
There is a hydropneumothorax.
Notice the air-fluid level (blue arrow).
The upper lobe is still attached to the
attached to the chest ... disease. ... disease that results ... airways leading to pulmonary ... Lymphangioleiomyomatosis #LAM #RadiologyAssistant
Consolidation is synonymous with airspace disease.
When you think of the causes of consolidation, think of 'what
with airspace disease ... UIP, NSIP and long ... Diagnosis #Radiology #Pulmonary ... #CTChest #Consolidation ... #Differential #RadiologyAssistant
Hilar and mediastinal lymphadenopathy
In sarcoidosis the common pattern is right paratracheal and bilateral hilar adenopathy ('1-2-3-sign').
In
adenopathy ('1-2-3-sign ... In lung carcinoma ... postirradiation Hodgkin disease ... Diagnosis #Radiology #Pulmonary ... #Differential #RadiologyAssistant
Hypoxemia / Hypoxia - Rapid Response Management Algorithm

Stridor - Upper airway pathology:
 • Anaphylaxis
 • Foreign
pneumonia • Water: pulmonary ... asthma • Pleural disease ... atelectasis • Lung ... Hypoventilation: • CNS ... Algorithm #rapid #pulmonary
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
responses of the lung ... involvement of the lung ... Diagnosis #Radiology #Pulmonary ... #CTChest #Idiopathic ... ILD #Findings #RadiologyAssistant
Approach to Eosinophilic Lung Diseases
 • Acute Eosinophilic Pneumonia (< 1 wk) - ~30yo, M; Recent
to Eosinophilic Lung ... Diseases • Acute ... , wt loss; CV, CNS ... #Diseases #pulmonary ... differential #diagnosis #comparison
Stage I - Redistribution
In a normal chest film with the patient standing erect, the pulmonary vessels
supplying the upper lung ... supplying the lung ... The pulmonary vascular ... In these cases comparison ... Redistribution #RadiologyAssistant
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
or interstitial lung ... disease (i.e. fibrosis ... Diagnosis #Radiology #Pulmonary ... #CTChest #GGO # ... #Differential #RadiologyAssistant