Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is increased opacity in the left lower lung , likely reflecting manifestation of low lung volumes with scattered photons . However , asymmetric vascular congestion or pneumonia can not be excluded . Otherwise , no other change since prior study .
    OUTPUT:
    
Left lower lung opacity , pneumonia can not be excluded in appropriate clinical setting .