Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal considering accentuation by low lung volumes . . The pulmonary vasculature is normal . Small left pleural effusion is present with adjacent minimal left basilar atelectasis . . There are no acute osseous abnormalities .
    OUTPUT:
    
Small left pleural effusion .