Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable single - view chest x-ray shows moderate lung volume without opacity concerning for pneumonia . There is no pleural effusion or pneumothorax . Heart size is moderately enlarged in patient with median sternotomy for prior cardiac surgery . The right IJ catheter ends in upper SVC , unchanged since prior chest x-ray .
    OUTPUT:
    
There are no signs of acute cardiopulmonary process . Cardiomegaly .