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Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
- Respiratory bronchiolitis ... #Upper #Lower #RadiologyAssistant
Nodular pattern(2)
1. Sarcoidosis: nodules with perilymphatic distribution, along fissures, adenopathy.
2. TB: Tree-in-bud appearance in a patient
Respiratory bronchiolitis ... Comparison #Table #RadiologyAssistant
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
predominance: Respiratory bronchiolitis ... pneumonitis, Respiratory bronchiolitis ... #Differential #RadiologyAssistant
Here another case of hypersensitivity pneumonitis.
There is a mosaic pattern.
Some secundary lobules demonstrate ground-glass opacity due
lucent due to bronchiolitis ... #GroundGlass #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
Respiratory bronchiolitis ... Comparison #Table #RadiologyAssistant
On the left a patient with RB-ILD.
The dominant feature is ground glass opacification and there are
that respiratory bronchiolitis ... RespiratoryBronchiolitis #ILD #RadiologyAssistant
Emphysema, when it is severe, can mimick Langerhans cell histiosytosis.
When it extends beyond the centrilobular area
emphysema, respiratory bronchiolitis ... CTChest #Emphysema #RadiologyAssistant
On the left a patient with ground glass pattern in a mosaic distribution.
Some lobules are involved
hypersensitivity pneumonitis, bronchiolitis ... HypersenstitivityPneumonitis #RadiologyAssistant
Subacute hypersensitivity pneumonitis
The key findings in the subacute hypersensitivity pneumonitis are:
ill-defined centrilobular nodules of ground-glass opacity
lucency due to bronchiolitis ... Centrilobular #RadiologyAssistant
It can be difficult to distinguish these three entities.
There are two diagnostic hints for further differentiation:
-
possibilities: obstructive bronchiolitis ... Temporary bronchiolitis ... Attenuation #Comparison #RadiologyAssistant