Ming-Chih Hsieh1, Chen Chi Wu1, Shih-Hao Wang2. 1. Department of Radiology (Hsieh) and Otolaryngology (Wang), Ditmanson Medical Foundation Chia-yi Christian Hospital, Chia-yi City, Taiwan; Department of Otolaryngology (Wu), National Taiwan University Hospital, Taipei, Taiwan. 2. Department of Radiology (Hsieh) and Otolaryngology (Wang), Ditmanson Medical Foundation Chia-yi Christian Hospital, Chia-yi City, Taiwan; Department of Otolaryngology (Wu), National Taiwan University Hospital, Taipei, Taiwan 07164@cycy.org.tw.