Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , leading to crowding of the bronchovascular structures . No focal consolidation , pleural effusion , pneumothorax , or pulmonary edema is seen . Stable , moderate to severe cardiomegaly is noted . The aorta is tortuous and contains atherosclerotic calcifications . Mediastinal contours are otherwise stable . Redemonstrated is a metallic density seen projecting over the heart , which may relate to a prior cardiac surgery . A left ventriculoperitoneal shunt is noted .
    OUTPUT:
    
No radiographic evidence for acute cardiopulmonary process .