Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation , pleural effusion or pneumothorax . An opacity at the left lung base may represent atelectasis or pneumonia . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities identified . Left shoulder arthroplasty is partially imaged . A Port - A - Cath terminates at the cavoatrial junction .
    OUTPUT:
    
Left lower lobe opacity could represent atelectasis versus pneumonia . Recommend clinical correlation for signs of infection .