Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New since the prior radiograph , there is left lower lobe opacification which could represent atelectasis , however aspiration and infection should be considered . No pleural effusion or pneumothorax . Heart size and mediastinal contours are normal .
    OUTPUT:
    
New left lower lobe consolidation possibly reflective of atelectasis , however infection can not be excluded .