Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views the chest provided . There is a small left pleural effusion with bilateral lower lobe and left perihilar consolidations likely representing atelectasis , though difficult to exclude a component of pneumonia . There is no overt edema . No large pneumothorax . Heart size can not be assessed . Mediastinal contour appears normal . Chronic deformity of the right humeral neck noted .
    OUTPUT:
    
Bibasilar and left perihilar opacities likely atelectasis versus pneumonia . No overt edema .