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More than 100 entities manifest as diffuse lung disease.
Fortunately only about 10 of these account for
diseases, that are ... some of them the old ... names are used ... Diagnosis #Radiology #Pulmonary ... Mnemonic #HRCT #RadiologyAssistant
Mosaic attenuation
The term 'mosaic attenuation' is used to describe density differences between affected and non-affected lung
Mosaic attenuation ... The term 'mosaic attenuation ... There are patchy ... Diagnosis #Radiology #Pulmonary ... #Differential #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
in interstitial lung ... , high and low attenuation ... is interstitial lung ... Diagnosis #Radiology #Pulmonary ... #Differential #RadiologyAssistant
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
responses of the lung ... these patterns are ... Diagnosis #Radiology #Pulmonary ... IdiopathicInterstitialPneumonia #ILD ... #Findings #RadiologyAssistant
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 ... comparison with old ... Redistribution #RadiologyAssistant
Basic Interpretation
A structured approach to interpretation of HRCT involves the following questions:
What is the dominant HR-pattern:
reticular
nodular
high
consolidation) low attenuation ... peripheral predominance Are ... Diagnosis #Radiology #Pulmonary ... Interpretation #Algorithm #ILD ... #RadiologyAssistant
On the left a typical case of panlobular emphysema.
There is uniform destruction of the underlying architecture
abnormally low attenuation ... Pulmonary vessels ... vascular markings are ... the other hand, mild ... PanlobularEmphysema #RadiologyAssistant
It can be difficult to distinguish these three entities.
There are two diagnostic hints for further differentiation:
-
in the 'black' lung ... bronchiolitis or chronic pulmonary ... right with the pulmonary ... MosaicAttenuation #Mosaic #Attenuation ... #Comparison #RadiologyAssistant
When a rib fracture heals, the callus formation may create a mass-like appearance (blue arrow).
Sometimes a
fracture from a lung ... Notice the large lung ... Probably we are ... Radiology #CXR #Old ... #Pseudotumor #RadiologyAssistant