A 2-month-old boy is brought to the physician after his parents palpated an abdominal mass while bathing him. They deny any fevers, chills, decreased urine output, or hematuria. On physical examination a large mass is palpated in the midline. Abdominal ultrasound shows pelvic kidneys fused at their lower poles. Which structure prevents this abnormal kidney from occupying its appropriate position?
一名2个月大的男孩被带到医生那里,他的父母在给他洗澡时摸到了一个腹部肿块。他们否认任何发热、寒战、尿量减少或血尿。体检时,在中线可触及一个大肿块。腹部超声显示盆腔肾下极融合。哪一种结构能阻止异常肾脏占据其适当位置?
(A) Aorta 主动脉
(B) Celiac trunk腹腔干
(C) Inferior mesenteric artery 肠系膜下动脉
(D) Inferior vena cava下腔静脉
(E) Superior mesenteric artery肠系膜上动脉
答案解析:
有一个没有从骨盆移出的肾脏提示马蹄肾。当两个肾的下极在发育过程中融合时,就形成了马蹄肾。当肾脏从肾盂上升时,它们遇到肠系膜下动脉,不能上升到腹部的正常水平。如果没有其他异常,这些患者通常无症状,但梗阻、感染和结石的风险确实增加。
正确答案:C
原创文章(本站视频密码:66668888),作者:xujunzju,如若转载,请注明出处:https://zyicu.cn/?p=17348