Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The previously seen left PICC has been removed . The heart and mediastinal contours appear normal . There is been marked interval improvement in the previously described left basal opacity and in the right perihilar and lower lobe opacities . No pleural effusion or pneumothorax .
    OUTPUT:
    
Marked interval improvement in the previously described left basal opacity and in the right perihilar and lower lobe opacities .