Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacities projecting over the left chest appear geographic and most suggestive of pleural plaques , unchanged since the earliest radiographs available . The patient is status post coronary artery bypass graft surgery . The lung volumes are low . The right major fissure appears thickened . It is also difficult to exclude a small pleural effusion on the right . The right hemidiaphragm shows similar mild elevation . There is no pneumothorax . The cardiac , mediastinal and hilar contours appear unchanged .
    OUTPUT:
    
Findings suggesting mild vascular congestion .