Sacral and Rectal Necrosis after Carbon Ion Radiotherapy Reconstructed with Transpelvic Rectus Abdominis Flap oleh Daisuke Atomura, MD, Takaya Makiguchi, MD, PhD, Hideharu Nakamura, MD, Yukie Yamatsu, MD, Katsuya Osone, MD, Yoko Motegi, MD, Hiroomi Ogawa, MD, Ken Shirabe, MD, PhD, Satoshi Yokoo, DMD, DMSc