Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . Cardiomediastinal silhouette is normal . There is no pleural effusion or pneumothorax . There is a small nodular opacity in the left lower lung . There is no displaced rib fracture identified .
    OUTPUT:
    
No acute cardiopulmonary process seen . Small nodular opacity in the left lower lung . This may be a focal area of atelectasis but recommend repeat radiographs in ___ weeks to re-evaluate .