Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest . Patient could not tolerate the lateral view . Compared with prior , there has been interval improved aeration at the left lung base . There may be small persistent effusion with blunting of the lateral costophrenic angle . Elsewhere the lungs are clear . The cardiomediastinal silhouette is stable . Median sternotomy wires are again noted . Orthopedic hardware is seen at the proximal right humerus . Old left lateral lower rib fracture is noted .
    OUTPUT:
    
Improved left basilar opacity with possible small residual left effusion . Otherwise , no acute cardiopulmonary process .