Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright AP view of the chest provided . Compared to prior studies , there is interval improvement of bibasilar opacities . There is possible mild residual opacity in the left lung base . Otherwise , there are no new areas of focal consolidation . There is no large pleural effusion . No pneumothorax is seen . There is mild cardiomegaly . The cardiomediastinal silhouette is normal . Mural calcifications are seen along the aorta . Imaged osseous structures are intact . Post - sternotomy wires and mediastinal clips are noted . Supporting lines and tubes have been intervally removed . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Interval improvement of bibasilar opacities with possible mild residual opacity in the left lung base . Otherwise , there is no new acute intrathoracic process .