Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The left apex is partially obscured by an overlying drape and monitor lead . There is no definite evidence of a pneumothorax . Bibasilar and retrocardiac pulmonary opacities and pleural fluid persist . The heart and mediastinal structures are unchanged . Tubes consistent with a mediastinal drain , left chest tube and a right subclavian catheter remain in place .
    OUTPUT:
    
Suboptimal study demonstrating no definite evidence of a pneumothorax , although the left lung apex is partially obscured . There is no significant interval change