Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . A pacer overlies the left chest wall with leads extending into the region of the right atrium and right ventricle . Lung volumes are low . The heart appears mildly enlarged . The lungs appear clear without effusion or pneumothorax . Chronic - appearing right lower rib deformity is again noted . Otherwise , the bony structures appear unremarkable .
    OUTPUT:
    
Mild cardiomegaly without definite signs of acute intrathoracic process .