Nephrolithiases, or kidney stones, can obstruct the flow of urine and cause pain. Stones are more likely to cause an obstruction at a junction or location where the tract is constricted. Which of the following describes a location where stones are most likely to cause an obstruction?
肾结石会阻碍尿的流动并引起疼痛。结石更有可能在尿道狭窄的连接处或位置造成阻塞。下列哪项描述了结石最有可能造成阻塞的位置?
(A) In the bladder 膀胱
(B) In the penile urethra阴茎尿道
(C) In the prostatic urethra前列腺尿道
(D) In the renal calyx肾花萼
(E) In the ureter over the iliac vessels髂血管上方的输尿管
答案解析：
正确答案：E
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