Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs were obtained . The lungs are somewhat low in volume with poor visualization of the left costophrenic angle , though this is likely due to the epicarrdial fat pad as no pleural effusion is seen on the lateral view . The heart is top normal in size with dual lead pacemaker again demonstrated . Lumbar fusion hardware and degenerative shoulder disease is incompletely assessed . No displaced rib fractures or pneumothorax is identified .
    OUTPUT:
    
No acute intrathoracic process