Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Two leads of a left chest wall pacer terminate in stable position in the right atrium and ventricle . An oblong density overlying the mid-heart to the left of the spine may be artifactual but a hiatal hernia or aortic calcification could have a similar appearance . Mild cardiomegaly and mediastinal contours are stable . The lungs are clear without focal consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
1 . Clear lungs . 2 . Oblong hyperdensity overlying the heart may be artifactual but lateral radiographs are recommended for further evaluation . Findings were communicated via phone call by Dr . ___ to Dr . ___ on ___ at ___ AM .