Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable supine chest radiograph obtained . The heart is markedly enlarged . There is no definite sign of pneumonia or overt CHF . No large pleural effusion or pneumothorax is seen . The mediastinal contour is stable with atherosclerotic calcification along the aortic knob . Bony structures are intact .
    OUTPUT:
    
Cardiomegaly , unchanged , no definite sign of pneumonia or overt CHF .