Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate well - expanded lungs . Interval improvement in retrocardiac atelectasis and resolution of left - sided pleural effusion . Cardiomediastinal silhouette is approaching baseline . The right lung is clear . No pneumothorax , pulmonary edema , or consolidation . Right - sided PICC line is in good position .
    OUTPUT:
    
Interval improvement in retrocardiac atelectasis and resolution of left - sided pleural effusion .