Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided PICC tip terminates at the junction of the SVC and right atrium . The cardiac , mediastinal and hilar contours are normal . Pulmonary vascularity is normal . There has been interval improvement in aeration of the lung bases with only minimal residual linear atelectasis noted in the left lower lobe . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Interval improvement in aeration of the lung bases with only minimal residual linear atelectasis .