Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is new opacity at the left lung base which likely represents a combination of effusion and atelectasis . The possibility of pneumonic consolidation is not excluded though air bronchograms are not seen . The right lung appears clear . Heart size can not be assessed accurately . The mediastinal contour is normal . Bony structures appear demineralized with no intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Left basal opacity likely a combination of atelectasis and effusion though infectious consolidation not excluded .