Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate no focal opacity convincing for pneumonia . Cardiomediastinal contours are similar in appearance relative to prior study dated ___ . There has been interval removal of a right PICC . Calcifications involve the aortic arch . No evidence of pulmonary edema . Flattened diaphragms suggests emphysematous changes . There is no pleural effusion or pneumothorax . Multilevel degenerative changes are present within the thoracic spine .
    OUTPUT:
    
No radiographic evidence of pneumonia .