Excision of an indeterminate retroperitoneal tumor.

未定型腹后肿瘤切除术。

The kidneys are roughly the size of a fist and are retroperitoneal, meaning they sit behind the peritoneal membrane alongside the vertebral column.

肾大概有一只拳头大小，为腹外器官；也就是说于腹后方、侧。

The bladder is a hollow, collapsible sac that temporarily stores urine. Like the kidneys, it's retroperitoneal, located posterior to the pubic bone and anterior to the rectum.

膀胱是一个中空、可折叠的囊，暂时储存尿液。像肾脏一样，于腹后，于耻骨后，直肠前。

Kidneys are retroperitoneal, which means they lie between the dorsal wall and the peritoneum — the membrane that surrounds the abdominal cavity — rather than inside the cavity itself, like your intestines and stomach do.

肾脏于腹后，这意味着于背壁和腹之间——腹是包围腹腔的——而不是像你的肠胃那样在腔内。