Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal radiograph of the chest demonstrates low lung volumes with elevation of the right hemidiaphragm as seen previously . There is no focal consolidation , pneumothorax , significant pulmonary edema or pleural effusion . The right subclavian line ends in the mid SVC . Median sternotomy wires are unchanged in position . The heart size is unchanged .
    OUTPUT:
    
No evidence of pneumonia . No significant change since the prior study .