Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . The lungs are clear . There is no consolidation , effusion or pulmonary vascular congestion . Cardiomediastinal silhouette is within normal limits . Left chest wall dual lead pacing device is seen with leads in unchanged positions . Large amount of free intraperitoneal air is identified below the bilateral hemidiaphragms . No acute osseous abnormality identified noting hypertrophic changes in the spine .
    OUTPUT:
    
Significant pneumoperitoneum . No acute process in the chest . Critical findings were discussed with Dr . ___ ___ the phone at 21 :00 on ___ at time of discovery .