Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lateral right costophrenic sulcus is obscured by a small right pleural effusion or peripheral atelectasis . Otherwise , the remainder of the lungs are clear with no evidence of consolidation , effusion , or pneumothorax . Cardiomediastinal silhouette is normal . Osseous structures are normal .
    OUTPUT:
    
Small right pleural effusion or basal atelectasis . No pneumoperitoneum .