Junko Ochi1, Taiki Nozaki2. 1. Department of Radiology, Suita Tokushukai Hospital, 21-1, Senriokanishi, Suita, Osaka, 565-0814, Japan. ochijun1213@gmail.com. 2. Department of Radiology, St. Luke's International Hospital, 9-1, Akashi-cho, Chuo-ku, Tokyo, 104-8560, Japan.