Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates normal cardiomediastinal silhouette . The lungs are well expanded and clear . There is no pneumothorax , vascular congestion , or pleural effusion . A small focal opacity is seen in the left costophrenic angle , likely atelectasis . There is no subdiaphragmatic air to indicate pneumoperitoneum .
    OUTPUT:
    
1 . No evidence of intraperitoneal free air . 2 . Small focal opacity in the left costophrenic angle , likely atelectasis . Consider repeat radiograph at full inspiration in a few weeks to confirm resolution .