Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the previous radiograph , there is no relevant change . The lung volumes are normal . The structure and transparency of the lung parenchyma is unremarkable . There is no evidence of pneumonia . No signs suggesting pulmonary edema . No pleural effusions . The size of the cardiac silhouette is at the upper range of normal . Mild tortuosity of the thoracic aorta . No hilar or mediastinal abnormalities .
    OUTPUT:
    
No evidence of pneumonia .