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Central distribution is seen in sarcoidosis and cardiogenic pulmonary edema.
Peripheral distribution is mainly seen in cryptogenic
in cryptogenic organizing ... pneumonia (COP) ... and UIP. ... #Diagnosis #Radiology ... #Pulmonary #HRCT
Cryptogenic Organizing Pneumonia (COP)

Cryptogenic Organizing Pneumonia Overview:
 • Idiopathic form of organizing pneumonia
 • formerly BOOP
: • CXR: Peripheral ... distribution of ... , Pulmonary lymphoma ... #BOOP #pulmonary ... #ILD #diagnosis
Notice that there are multiple densities in both lungs.
The larger ones are ill-defined and maybe there
maybe there is an air-bronchogram ... #Clinical #Radiology ... #CXR #Peripheral ... #Distribution # ... Organizing #Pneumonia
Differential diagnosis
The table summarizes the most common diseases, that present with consolidation.
Chronic diseases are indicated in
the pattern of distribution ... Other examples are organizing ... OP is organizing ... #Diagnosis #Radiology ... #Pulmonary #CXR
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
bronchiolitis (RB-ILD ... is seen in: - UIP ... edema #Diagnosis #Radiology ... #Pulmonary #HRCT ... Differential #Table #Distribution
Differential diagnosis of the reversed halo sign (RHS). AIA, angioinvasive aspergillosis; AIS, adenocarcinoma in situ; COP,
COP, cryptogenic organising ... ; OP, organising ... ; PZ, pulmonary ... perilymphatic distribution ... #Radiology #RHS
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
idiopathic interstitial pneumonias ... and interstitial pneumonia ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... IdiopathicInterstitialPneumonia #ILD