Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate normal cardiomediastinal silhouette . The lungs are clear . There is no pneumothorax , vascular congestion , or pleural effusion . Trace opacity in the left costophrenic angle is likely related to atelectasis upon correlation with subsequent CT . A biliary stent is in place .
    OUTPUT:
    
No acute cardiopulmonary process . Left costophrenic angle opacification is consistent with atelectasis upon correlation with CT .