Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single semi-upright portable radiograph of the chest was acquired . Lung volumes are slightly low , decreased compared to the prior study . Left retrocardiac consolidative opacification and right lower lung patchy opacities are increased compared to the prior study , possibly secondary to atelectasis , although an infectious process could have a similar appearance . Mild perihilar fullness is suggestive of mild vascular congestion . The heart size is at the upper limits of normal size . The mediastinal contours are normal . Small bilateral pleural effusions are suspected . There is no pneumothorax .
    OUTPUT:
    
1 . Bibasilar opacities , left greater than right , possibly secondary to atelectasis , although aspiration pneumonitis and / or pneumonia could have a similar appearance . Clinical correlation recommended . 2 . Findings suggesting mild central pulmonary vascular congestion . 3 . Probable small bilateral pleural effusions .