Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal radiograph of the chest demonstrates clear lungs with no increased interstitial markings concerning for pulmonary edema . The cardiac contour is top normal . The mediastinum is normal . No pleural effusion or pneumothorax is seen . Aortic calcifications are noted .
    OUTPUT:
    
No evidence of pulmonary edema , pleural effusions , pneumothorax , or pneumonia .