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，为腹外位器官；也就们位于腹后方、脊柱。

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.

膀胱一个中空、可折叠的囊，暂时储存尿液。像肾脏一样，位于腹后，位于耻骨后，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.

肾脏位于腹后，这意味着们位于背壁和腹之间——腹包围腹腔的——而不像你的肠胃那样在腔内。