Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume and show new left lower lobe opacity with a possible associated effusion . Enlarged pulmonary arteries are unchanged . A spiculated left upper lobe mass is not adequately imaged on the current study . The cardiomediastinal silhouette is normal . No pneumothorax is present .
    OUTPUT:
    
No pneumothorax . Left lower lobe opacity , atelectasis with possible associated effusion , underlying consolidation not excluded . Unchanged enlarged pulmonary arteries .