Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta remains tortuous and diffusely calcified . Mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is normal . Patchy opacity is noted within the left lower lobe which is concerning for an area of pneumonia . No pleural effusion or pneumothorax is seen . Multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Patchy left lower lobe opacity concerning for pneumonia .