Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval resolution of the previously seen mild opacity in the left upper lobe . Bibasilar linear atelectasis is noted . No pleural effusion or pneumothorax is seen . The cardiac , hilar and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Interval resolution of left upper lobe pneumonia . Linear bibasilar atelectasis is noted . No acute cardiopulmonary process .