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【春节特刊进修生系列课件】肾脏超声诊断(初七)

  • 2026-04-14 17:39:33
【春节特刊进修生系列课件】肾脏超声诊断(初七)

肾脏超声

— 溆浦城南医院超声科 —

01

解剖结构

01

解剖位置

● 成对器官,左右各一,位于腹膜后脊柱两旁。

● 右肾略低于左肾;左肾上端平 T11 下缘、下端平 L2 下缘,右肾上端平 T12 上缘、下端平 L3 上缘。

● 两肾上极靠近脊柱,下极远离,呈"八"字排列。

● 正常大小:长 10–12 cm、宽 5–6 cm、厚 4–5 cm。

02

形态特征

外缘凸、内缘凹,凹面中部为肾门,肾静脉、肾动脉、肾盂输尿管连接部由前向后依次出入。

肾实质结构

● 皮质:外围,血管丰富,含肾小体与曲小管。

● 髓质:15–20 个肾锥体组成,锥体底朝皮质,尖端为肾乳头。(髓质主要浓缩尿液)。

● 肾柱:皮质伸入髓质部分。

● 乳头孔:肾乳头尖端多个小孔,尿液由此排出。

集合系统(尿液引流路径)

乳头孔 → 肾小盏(7–8 个漏斗形)→ 肾大盏(2–3 个小盏汇成)→ 肾盂(前后扁平漏斗)→ 输尿管 → 膀胱。

肾被膜

● 肾筋膜:最外层,结缔组织,固定肾与肾上腺。  

● 脂肪囊:中层,厚度不均(肾门、肾缘最厚),缓冲、保温。  

● 纤维囊:内层,薄而韧,正常易剥离,病变时与肾粘连。

肾周感染/脓肿好发于“筋膜-脂肪囊”间隙。

肾盂和肾盏

● 肾盂是收集尿液的部位,肾盏则像小杯子一样收集来自肾小球的尿液。

● 肾盂的三种解剖类型:

肾内型:肾盂细小,大部分在肾门内,呈树枝状。

肾外型(壶腹型):肾盂大且多位于肾门外,短时肾大盏直接汇入,超声易误判为轻度积水。

分支型:肾盂呈分叉状,由两条粗长肾大盏组成。

输尿管连接

肾盂向下延伸形成输尿管,负责将尿液输送到膀胱,是尿液排出体外的通道。

集合系统的超声表现

超声检查中,集合系统表现为肾脏内部的液性暗区,有助于诊断肾积水等问题。

血管分布

● 肾动脉的分支结构:肾动脉进入肾脏后,分为多个小分支,形成弓形动脉,进而延伸为细小的入球小动脉。

● 肾静脉的引流路径:肾静脉收集肾小球滤液,形成出球小动脉,最终汇集成肾静脉,将血液引出肾脏。

● 毛细血管网的形成:肾小球内充满毛细血管网,是血液过滤的重要场所,形成尿液的初级过滤结构。

肾段与血供

● 肾动脉入肾前分前、后两支 → 5 条段动脉 → 5 个肾段:上段、上前段、下前段、下段、后段。  

● 段动脉之间几乎无吻合,一旦阻塞即出现节段性缺血坏死。

02

肾毗邻关系

● 右肾

前上:肝右叶、胆囊

前中:十二指肠降部

前下:结肠肝曲

内侧:肾上腺

背侧:膈、腰大肌、腰方肌、腹横肌

● 左肾

前上:胃底、脾血管、胰尾

前中:结肠脾曲

外侧:脾

内侧:肾上腺

背侧:膈、腰大肌、腰方肌、腹横肌

肿瘤、炎症易互相侵犯或转移

03

肾生理速览

● 肾血流 600 mL/min,5 min 过滤全身血液一次。

● 肾小球滤过 120 mL/min,99 % 被重吸收。  

● 肾素-血管紧张素系统:失血/脱水 → 肾素↑ → 小动脉收缩 + 醛固酮↑ → 升压、保钠、扩容量。

● 滤过膜组成:

   1.有孔内皮细胞

   2.基膜

   3.足细胞足突

04

输尿管解剖与狭窄

● 长度 20–30 cm,内径 0.5–0.7 cm,分腹段、盆段、膀胱壁内段。  

● 3 个生理狭窄(内径 2–3 mm,结石最易卡):

① 肾盂输尿管交界;

② 跨越髂血管处;

③ 膀胱壁内段:壁内段斜穿膀胱肌层,充盈时受压闭合,防止尿液反流;发育过短→反流。

05

检查要点

检查前的饮食与饮水指导

患者在超声检查前需禁食数小时,以减少肠道气体干扰,憋尿使膀胱充盈,确保图像清晰。

患者体位的调整

● 肾:仰卧冠状、侧卧、俯卧、坐/立位观察活动度。

● 输尿管:仰卧侧腰部追踪、俯卧背部扫查、侧卧沿积水走行、已婚女可经阴道、男女均可经直肠查盆段。

涂抹耦合剂的作用

在皮肤与超声探头之间涂抹耦合剂,以减少空气间隙,提高超声波的传导效率。

扫查顺序

● 肾:侧腰冠状 → 横切 → 背部纵/横 → 上腹部看肾动静脉。  

● 输尿管:从肾盂输尿管连接部开始,沿扩张管腔逐段向下,重点看三狭窄;用充盈膀胱做声窗看盆段及喷尿。

观察内容

● 肾:位置、大小、轮廓、实质厚度与回声、髓质大小、肾窦比例、积水程度、占位(囊/实、血供)、结石强回声及声影、毗邻关系、肾周淋巴结。

● 输尿管:是否扩张、走行、管壁厚度与蠕动、狭窄或中断形态、腔内结石、肿瘤、喷尿频率与方向、输尿管口有无膨出或结节。

● 彩色多普勒可评估占位血供及输尿管口尿流信号,辅助鉴别良恶性与反流。

06

肾脏的超声图像标准切面

肾脏结构回声:

● 皮质:低回声

● 集合系统、输尿管壁、髓质:高回声

● 包膜:高回声

声明:文章内容仅供学习使用,如有侵权,请联系删除

溆浦城南医院超声科

曾林波  副院长/功能科主任  主任医师

13789280298(微信同号)

一对一手把手带教,让每个进修学员都能学有所成

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  1. CONNECT:[ UseTime:0.001215s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001870s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.020321s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000812s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001918s ]
  6. SELECT * FROM `set` [ RunTime:0.000770s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001840s ]
  8. SELECT * FROM `article` WHERE `id` = 472957 LIMIT 1 [ RunTime:0.001332s ]
  9. UPDATE `article` SET `lasttime` = 1776647697 WHERE `id` = 472957 [ RunTime:0.007146s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000800s ]
  11. SELECT * FROM `article` WHERE `id` < 472957 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001353s ]
  12. SELECT * FROM `article` WHERE `id` > 472957 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001322s ]
  13. SELECT * FROM `article` WHERE `id` < 472957 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012246s ]
  14. SELECT * FROM `article` WHERE `id` < 472957 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004233s ]
  15. SELECT * FROM `article` WHERE `id` < 472957 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008291s ]
0.274338s