Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mildly enlarged . The aorta is calcified along the arch . There is patchy left basilar opacity involving the lingula and left lower lobe , probably compatible with atelectasis . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Opacities at the left lung base , probably compatible with atelectasis . Infectious process is not excluded , however .