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The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
responses of the lung ... Diagnosis #Radiology #Pulmonary ... #CTChest #Idiopathic ... IdiopathicInterstitialPneumonia #ILD ... #Findings #RadiologyAssistant
The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
Honeycombing Most diseases ... basis of HRCT findings ... Diagnosis #Radiology #Pulmonary ... #CTChest #LowAttenuation ... Emphysema #SignetRing #RadiologyAssistant
Figure 3 HRCT-LUS correlation in normal lung, pulmonary congestion, rheumatoid lung disease, idiopathic pulmonary fibrosis.
Notes: (A)
lung, pulmonary ... disease, idiopathic ... pulmonary fibrosis ... Correlation #Table #ILD ... #Findings
Approach to the A-a Gradient
A-a gradient = PAO2 - PaO2
A-a gradient = [FiO2 x (Patm -
/0.8)] - PaO2 Normal ... Hypoventilation: CNS ... Embolism, Obstructive Lung ... Disease and more ... , Interstitial Lung
Pulmonary Hypertension Groups - WHO Classification
Group I - Vascular remodeling of pulmonary arteries
 • Idiopathic, HIV,
III - Chronic lung ... hypoxemia • COPD, ILD ... issues at rest, but normal ... dyspnea, fatigue, or chest ... dyspnea, fatigue, chest
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
about imaging findings ... in interstitial lung ... disease comes from ... Diagnosis #Radiology #Pulmonary ... #Differential #RadiologyAssistant
Bronchiectasis is defined as localized bronchial dilatation.
The diagnosis of bronchiectasis is usually based on a combination
the following findings ... thickening - lack of normal ... the peripheral lung ... Diagnosis #Radiology #Pulmonary ... #Differential #RadiologyAssistant
Stage I - Redistribution
In a normal chest film with the patient standing erect, the pulmonary vessels
Redistribution In a normal ... supplying the upper lung ... supplying the lung ... comparison with old ... Redistribution #RadiologyAssistant
Lung infarction
In pulmonar embolism it is not common to see consolidation.
The consolidation is a result of
Lung infarction ... Here we see an old ... is normal. ... Radiology #CXR #CTChest ... PulmonaryEmbolism #RadiologyAssistant
Based on the images alone, it is usually not possible to determine the cause of the
findings. ... between these chest ... nodular interstitial lung ... disease, that is ... Consolidation #Causes #RadiologyAssistant