Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest radiograph demonstrates clear lungs bilaterally . Heart is enlarged though stable when compared to prior study . There is no evidence of overt pulmonary edema . There is no pleural effusion or pneumothorax . The aorta is calcified and tortuous resulting in rightward bowing of the trachea . Mediastinal and hilar contours are otherwise unremarkable . Degenerative changes throughout the thoracic spine noted .
    OUTPUT:
    
No acute intrathoracic abnormality .