Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal contours are unchanged . Pulmonary vascularity is not engorged . A moderate right - sided pleural effusion is noted and a small left pleural effusion is also present , findings likely similar when compared to the prior exam . Left basilar opacity could reflect compressive atelectasis , although infection can not be excluded . There is no pneumothorax . Degenerative changes of the thoracic spine are present .
    OUTPUT:
    
Moderate size right and small left pleural effusions , similar when compared to the prior study . Left basilar opacity likely reflects compressive atelectasis , but infection can not be excluded .