Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . There is mild unfolding of the thoracic aorta . Surgical clips project along the left anterior chest wall . There is no pleural effusion or pneumothorax . There is a patchy left lower lobe opacity and atelectasis in the left lower lobe , probably unchanged and chronic . Bony structures are unremarkable .
    OUTPUT:
    
Patchy persistent left lower lobe opacity , likely correlating with airway inflammation and mucus impaction on prior studies , without definite evidence for acute superimposed disease .