The patient expired and an autopsy disclosed that there was a hemoperitoneum which had prevented air from the pneumoretroperitoneum to enter the peritoneal cavity.

• 尸体解剖证实腹腔内有积血。腹腔内积血造成单一性的后腹腔积气是因其压力阻止气体从后腹腔进入腹腔内。