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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 ... - Emphysema - Lung ... Most diseases with ... #Diagnosis #Radiology ... #Pulmonary #CTChest
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
Differential diagnosis ... in interstitial lung ... is interstitial lung ... we are dealing with ... #Diagnosis #Radiology
Here another case of hypersensitivity pneumonitis.
There is a mosaic pattern.
Some secundary lobules demonstrate ground-glass opacity due
pattern. ... opacity due to lung ... bronchiolitis with ... #Clinical #Radiology ... #CTChest #Hypersensitivity
COVID-19 Chest CT - Case 4

Main aspects of the image: multiple opacities in the glass and
periphery of two lungs ... a multilobular pattern ... opacities and mosaic ... Radiologia Torácica ... COVID19 #SARSCoV2 #CTChest
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On the left a patient with ground glass pattern in a mosaic distribution.
The clue here is
ground glass pattern ... in a mosaic distribution ... hyperperfused lung ... #Clinical #Radiology ... #CTChest #GGO #
On the left another patient with ground glass pattern in a mosaic distribution.
Again the ground glass
ground glass pattern ... in a mosaic distribution ... hyperperfused lung ... #Clinical #Radiology ... #CTChest #GGO #
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
have specific patterns ... vascular diseases (e.g ... instance in patients with ... #Diagnosis #Radiology ... #Pulmonary #CTChest
Mosaic attenuation
The term 'mosaic attenuation' is used to describe density differences between affected and non-affected lung
Mosaic attenuation ... with air-trapping ... thromboembolic disease #Diagnosis ... #Radiology #Pulmonary ... #CTChest #MosaicAttenuation
Chronic hypersensitivity pneumonitis (2)
The case on the left shows an inspiratory and expiratory scan: the mosaic
pattern with areas ... mid and lower lung ... a mozaic pattern ... #Clinical #Radiology ... #CTChest #Chronic
On the left a patient with ground glass pattern in a mosaic distribution.
Some lobules are involved
ground glass pattern ... in a mosaic distribution ... The differential diagnosis ... #Clinical #Radiology ... #CTChest #GGO #