Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is difficult to assess given the presence of a small left pleural effusion . The extent of this effusion is similar compared to the prior study . A trace right pleural effusion appears increased compared to prior . The mediastinal and hilar contours are relatively unchanged . There may be mild pulmonary vascular congestion but no overt pulmonary edema is identified . Left basilar opacification likely reflects atelectasis . No pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Unchanged small left , and increased small right , bilateral pleural effusions . Persistent left basilar opacification likely reflecting compressive atelectasis .