It is very important to differentiate between acute consolidation and chronic consolidation, because it will limit the differential diagnosis. In chronic disease we think of: - Neoplasm with lobar or segmental post-obstructive pneumonia. - Lung neoplasms like bronchoalveolar carcinoma and lymphoma. - Chronic post-infection diseases like organizing pneumonia (OP) or chronic eosinophilic pneumonia, which both present with multiple peripheral consolidations. - Sarcoidosis is the great mimicker and sometimes the granulomatous noduli are so small and diffuse that they can present as consolidation. This is known as alveolar sarcoidosis. - Alveolar proteinosis is a rare chronic disease that is characterized by filling of the alveoli with proteinaceous material. #Diagnosis #Radiology #Pulmonary #CXR #Consolidation #Acute #Chronic #Differential #RadiologyAssistant
