Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient had has been extubated since the ___ radiograph . The heart size is normal . The hilar and mediastinal contours are unchanged . There is central pulmonary vascular engorgement , but no pulmonary edema . The lungs are underinflated , further exaggerating the pulmonary vasculature . A small right pleural effusion is present . Bibasilar linear opacities likely reflect atelectasis .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis . No pulmonary edema . Small right pleural effusion .