Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Small left pleural effusion has increased compared to the previous chest radiograph . There is adjacent left basilar opacity likely reflective of atelectasis . Right lung is clear . No pneumothorax is identified . No acute osseous abnormalities present .
    OUTPUT:
    
Small left pleural effusion , increased compared to the previous radiograph , with left basilar opacity likely reflective of atelectasis .