Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrate mildly hypoinflated clear lungs . No focal opacity seen . No pleural effusion or pneumothorax . Persistent mild cardiomegaly is again noted and slightly decreased from previous examination . Tortuous aorta is similar to prior . Mediastinal contour and hila are otherwise unremarkable . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
No acute cardiopulmonary process .