Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The heart appears mildly enlarged . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . Patchy opacities in the right middle lobe , lingula and left lower lobe could be due to atelectasis but potentially pneumonia or aspiration depending on clinical circumstances . Bony structures are unremarkable .
    OUTPUT:
    
Opacities at the lung bases ; atelectasis , pneumonia or aspiration could be considered .