Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume but clear . The cardiac silhouette is mildly enlarged . The mediastinal silhouette and hilar contours are normal . No pleural effusion or pneumothorax is present . Evidence of a left radical nephrectomy is noted suggested by clips in the left upper quadrant .
    OUTPUT:
    
No evidence of acute intrathoracic process .