Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Heart size and cardiomediastinal contours are stable . Linear opacity in the right lung is consistent with atelectasis . No substantial pleural effusion or pneumothorax . Leads of a left chest wall generator pack terminate in the right atrium and right ventricle . A third cardiac lead is in unchanged position since ___ .
    OUTPUT:
    
Cardiomegaly with low lung volumes . No convincing sign of pneumonia or CHF .