Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate multiple intact sternotomy wires and an unchanged cardiomediastinal silhouette . The mildly hyperexpanded lungs are clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of pneumonia . A preliminary read was provided , upon request , via telephone by Dr . ___ ___ to Dr . ___ at ___ on ___ .