Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 2 views of the chest were obtained . The lungs are lower in volume compared to the previous examination with increased bibasilar predominantly linear opacities consistent with atelectasis . No definite effusion is seen although trace left effusion would be difficult to entirely exclude . There is no pneumothorax . Heart is top - normal in size with normal mediastinal contours .
    OUTPUT:
    
Bibasilar opacities are most likely atelectasis .