Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright portable view of the chest demonstrates low lung volumes , which accentuate bronchovascular markings . There is a small left pleural effusion . Left basilar opacities are noted . Mild perihilar vascular congestion is noted . Otherwise , hilar and mediastinal silhouettes are unremarkable . Heart size is normal . Right internal jugular central venous catheter tip projects over mid SVC .
    OUTPUT:
    
Small left pleural effusion . Perihilar vascular congestion . Bibasilar opacities , likely atelectasis , however , superimposed infection can not be excluded .