Abdominal complications due to collapse of a large mesenteric hematoma after rupture of a right colic artery aneurysm: a case report oleh Taro Ikeda, Masaaki Mitsutsuji, Takuya Okada, Isamu Yamada, Ryunosuke Konaka, Yukari Adachi, Akiko Matsumoto, Takahiro Wada, Naoki Harada, Masahiro Samizo