Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderate cardiomegaly persists . The mediastinal and hilar contours are unchanged . There is no pulmonary edema . Small left pleural effusion with left basilar opacity likely reflective of atelectasis is demonstrated , but infection is not excluded in the correct clinical setting . No right - sided pleural effusion is seen . There is no pneumothorax . No acute osseous abnormalities are present .
    OUTPUT:
    
Small left pleural effusion with left basilar opacity likely reflective of atelectasis . Infection can not be completely excluded .