Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There is minimal atelectasis at the left base . Slight blunting of the posterior costophrenic angles on the lateral view may be due to trace pleural effusions .
    OUTPUT:
    
Slight blunting of the posterior costophrenic angles on the lateral view may be due to trace pleural effusions . Left basilar atelectasis .