大動脈内バルーン遮断の予防的使用により脾動脈瘤破裂の緊急開腹止血術中に良好な循環動態を保ち得た1例(A case of a stable hemodynamic condition during urgent laparotomy maintained by prophylactic use of resuscitative endovascular balloon occlusion of the aorta (REBOA) in a patient with ruptured splenic artery aneurysm). Issue 2 (18th February 2021)