Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are subtle nodular opacities in the lower lobes bilaterally . The cardiac contour is unremarkable . There is tortuosity of the thoracic aorta . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Subtle opacities in the lower lobes bilaterally may represent early pneumonia in the correct clinical setting .