Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is elevation of the left hemidiaphragm and a retrocardiac opacity , consistent with left lower lobe collapse . This is similar to the prior exam . There is a small left pleural effusion only appreciated on the lateral view . The right lung is essentially clear . There is no right pleural effusion . No pneumothorax is identified . The cardiomediastinal silhouette size is at the upper limits of normal . Noted are prominent air - filled loops of bowel in the upper abdomen , which are only partially imaged .
    OUTPUT:
    
Left lower lobe collapse and small left pleural effusion .