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The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
idiopathic interstitial pneumonias ... listed in the table ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... #RadiologyAssistant
Notice that there are multiple densities in both lungs.
The larger ones are ill-defined and maybe there
air-bronchogram in the right lower ... the differential diagnosis ... The lab-findings ... #Clinical #Radiology ... OrganizingPneumonia #BOOP #RadiologyAssistant
The case on the left shows subpleural honeycomb cysts in several contiguous layers.
There is also a
There is also a lower ... These findings are ... Usual Interstitial Pneumonia ... #Clinical #Radiology ... #CTChest #UIP #
On the left an immunocompromised patient with PCP.
The CT findings are diffuse ground-glass opacification.
The findings are
the most likely diagnosis ... #Clinical #Radiology ... #CTChest #PJP # ... Pneumocystis #Pneumonia ... #RadiologyAssistant
HRCT findings in OP
- Bilateral peripheral consolidations, sharply demarcated.
- Consolidations may be migratory.
- Lesions may show
HRCT findings in ... carcinoma, the diagnosis ... #Clinical #Radiology ... #CTChest #COP # ... #ILD #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
Differential diagnosis ... about imaging findings ... low attenuation (table ... #Diagnosis #Radiology ... #Differential #RadiologyAssistant
Based on the images alone, it is usually not possible to determine the cause of the
non-pulmonary findings ... between these chest ... #Clinical #Diagnosis ... #Radiology #CXR ... Consolidation #Causes #RadiologyAssistant
On the left two cases with chronic consolidation. 
There are patchy non-segmental consolidations in a subpleural
The final diagnosis ... the HRCT findings ... this #Clinical #Radiology ... #CTChest #COP # ... OrganizingPneumonia #RadiologyAssistant
Basic Interpretation
A structured approach to interpretation of HRCT involves the following questions:
What is the dominant HR-pattern:
reticular
nodular
high
an upper versus lower ... there additional findings ... bronchiectasis) #Diagnosis ... #Radiology #Pulmonary ... #HRCT #CTChest
UIP with honeycombing (left) and chronic HP (right)
Differential diagnosis of Hypersensitivity Pneumonitis.
Subacute stage:
- RB-ILD: seen in
) Differential diagnosis ... very similar HRCT findings ... UIP has a strong lower ... #Radiology #CTChest ... Fibrosis #Mimic #ILD #RadiologyAssistant