Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mildly hypoinflated lungs with crowding of vasculature and bibasilar atelectasis . New heterogeneous right lower lobe opacity best seen on lateral projection . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the osseous structures are remarkable and upper abdomen is within normal limits .
    OUTPUT:
    
New right lower lobe opacity in a patient with sickle cell disease is concerning for acute chest syndrome . Differential includes pneumonia and atelectasis . Clinical correlation is recommended .