Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval development of right perihilar and right basilar opacities and to lesser extent left base opacity raising concern for multifocal pneumonia , versus asymmetric pulmonary edema . No large pleural effusion is seen although there may be a trace left pleural effusion . The cardiac and mediastinal silhouettes are stable and unremarkable . Calcification is seen at the aortic knob .
    OUTPUT:
    
Interval development of right perihilar and right basilar opacities and to a lesser extent possible minor left base opacity which could be due to multifocal infection or less likely , but possible asymmetric pulmonary at the left , depending on the clinical scenario .