Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a right subclavian catheter with tip in the deep right atrium . Small left pleural effusion persists . No significant pneumothorax . Overall low lung volumes , with increased left perihilar and persistent left lower lobe opacities . Right lung is clear . Heart size is normal .
    OUTPUT:
    
Increased left lung opacities , likely atelectasis .