Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette and pulmonary vasculature are unremarkable . The mediastinal contours are similar to the most recent examination , and largely unremarkable . There is no pleural effusion or pneumothorax . The lungs are clear aside from basilar atelectasis .
    OUTPUT:
    
No acute intrathoracic abnormality .