Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low accentuating the cardiac silhouette and pulmonary vasculature . Heart size is top - normal with mild unfolding of the thoracic aorta . Hilar contours are unremarkable . There are probable trace bilateral pleural effusions . Similar left retrocardiac density . Lungs are otherwise clear . There is no pneumothorax .
    OUTPUT:
    
Probable trace bilateral pleural effusions . Similar appearing left retrocardiac density could be pneumonia in the appropriate circumstance .