Tatsuya Sekiguchi1, Shunji Hirose2, Takuya Hara3, Jun Koizumi3. 1. Department of Radiology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa, 259-1193, Japan. Electronic address: TatsuyaSekiguchi@tokai.ac.jp. 2. Department of Gastroenterology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa, 259-1193, Japan. 3. Department of Radiology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa, 259-1193, Japan.