Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette and lungs which are low in volume but clear . There is no radiographic evidence of a pulmonary embolus . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No radiographic evidence of a pulmonary embolus or pneumonia .