Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right PICC tip terminates in the superior aspect of the SVC . The cardiac , mediastinal and hilar contours are unremarkable . Linear opacity in left mid lung field likely reflects subsegmental atelectasis . There is mild pulmonary vascular congestion , but this is improved compared to the prior study . No focal consolidation , pleural effusion or pneumothorax is present . There are punctate radiopaque densities projecting over the right lung base , which are unchanged from the prior study .
    OUTPUT:
    
Low lung volumes with improved mild pulmonary vascular congestion . Subsegmental atelectasis in the left mid lung field .