Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is new left lower lobe opacity compatible with infection . Elsewhere , lungs are clear . Lobulated contour abutting the aortic arch and projecting over the AP window on the frontal view is compatible with thoracic aortic aneurysm with prior dissection . No acute osseous abnormalities .
    OUTPUT:
    
Left lower lobe consolidation compatible with pneumonia . Repeat after treatment suggested to document resolution . Stable appearance of the mediastinum with abnormal aortic contour as seen on multiple priors .