1. Department of Radiology, Chonbuk National University Medical School and Hospital, Jeonju 561-712, Korea.
2. Department of Otolaryngology-Head and Neck Surgery, Chonbuk National University Medical School and Hospital, Jeonju 561-712, Korea.
3. Department of Pathology, Chonbuk National University Medical School and Hospital, Jeonju 561-712, Korea.