Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a stable appearance of a tortuous thoracic aorta . There is mild enlargement of the cardiac silhouette , as on prior exams . The hila are unremarkable . Lung volumes are low , with crowding of normal bronchovascular structures . New since prior is an airspace opacity projecting lateral to the left heart border , within the left lower lung . There is no pulmonary vascular congestion or pulmonary edema . There is no focal consolidation . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
New left lower lung opacity is concerning for pneumonia in the correct clinical setting .