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春节特刊进修生系列课件】肠套叠超声诊断(十三)

  • 2026-04-02 21:06:01
春节特刊进修生系列课件】肠套叠超声诊断(十三)

肠套叠

— 溆浦城南医院超声科 —

01

病理生理

定义

肠套叠(intussusception)是指近端肠管及其系膜套入远端肠腔内的一种肠梗阻,是婴幼儿时期常见的急腹症之一。

病因

● 原发型: 一般均发生于婴幼儿及儿童,病因未完全清楚:可能与饮食的改变,小儿回盲部系膜未完全固定、活动度较大,腺病毒感染有关。

● 继发型:成人肠套叠,80%为器质性病变,可继发于肠炎、肠壁血肿、肠重复畸形、肠息肉、急腹症术后、肠恶性淋巴瘤、美克尔憩室等。

构成

肠套叠的部分由三层肠壁组成:外层为鞘部(外筒),中层为套叠肠段的折入部(中筒),最内层为套叠肠段的返回部(内筒),套入部的前端称为头部,套叠肠段的入口处称为颈部、系膜附着于肠壁的一侧,随套人肠段进人中筒与内筒之间。

02

表现

临床表现

● 腹痛:  阵发性疼痛,为早期出现的症状,每次发作约10~20分钟。这种有规律的腹痛,是由于较强的肠蠕动波把套入的肠管向前推进,牵拉肠系膜,同时套叠鞘部发生强烈收缩所引起。

● 呕吐: 早期症状之一,呕吐物早期为乳汁,稍后带有胆汁, 晚期为粪质。

● 便血: 是本病特征之一,发生在疾病开始后8~12小时。呈果酱色血便,亦可为新鲜血便或血水,当疑为本病而尚无便血时可作直肠指检,如指检染血则有同样诊断意义。

● 腹部肿块: 腊肠样包块,随疾病不同时期肿块位置发生改变,早期多位于右侧上腹部肝下,晚期沿结肠移至腹部左侧,最远可达直肠内。

● 全身情况:发病早期病儿全身情况尚好,体温正常,仅有面色苍白,食欲不振或拒食。随发病时间延长,一般情况逐渐严重,表现精神萎靡、嗜睡、脱水、腹胀,甚至休克征象。

超声表现

● 腹部存在混合回声包块,其周边存在少量液性暗区。

● 横断面呈“同心圆”征,外部存在均匀的低回声,主要为远端肠壁回声,中间呈不均匀低回声或高回声,则为被套入肠管的肠粘膜界面、系膜组织及内容物。

● 纵切面呈“套筒”征,以对称的多层结构为主,低回声与高回声相间,套筒直径为16-52mm。

● 套叠包块近端存在积气积液、肠管扩张等肠梗阻表现。

● CDFI:早期肠套叠血供丰富,晚期由于坏疽则肠管血流信号消失。

● 同心圆征:为所有肠套叠超声图像特点——套叠包块短轴切面图像,中央高回声、周边低回声的“车轮”样或“同心圆”征;外径一般>3cm;外层为鞘部肠管,内层为套入部肠管,套入部肠管萎瘪。

● 套筒征:为套叠包块纵切面图像,两边呈多层(套叠的三层管壁)的混合性包块。

03

分型

● 根据套叠的部分可以分为空肠套空肠、空肠套回肠、回肠套回肠、回肠套盲肠、回肠套结肠、结肠套结肠等。空肠上端逆行套入胃内,更为罕见。

● 被套入的肠段进入鞘部后,其顶点可继续沿肠管推进,肠系膜也被牵入,肠系膜血管受压迫,造成局部循环障碍,逐渐发生肠管水肿,肠腔阻塞,套入的肠段被绞窄而坏死,鞘部则扩张呈缺血性坏死,甚至穿孔。

● 回肠盲肠结肠型:回肠套盲肠再进入结肠;回盲瓣是肠套叠头部,带领回肠末端进入升结肠,盲肠、阑尾也随着翻入结肠内,此型最常见。

● 回肠结肠型:回肠从具回盲瓣几厘米处起,套入回肠最末端,穿过回盲瓣进入结肠。可占95%。 

● 小肠小肠型:小肠套小肠。 

● 结肠结肠型:结肠套结肠。

鉴别诊断

● 通过大小鉴别:回结肠套叠、小肠套叠及阑尾炎可以从同心圆直径鉴别:

阑尾炎同心圆直径多在1.0cm一下。

小肠套叠同心圆在2cm左右。

回结肠套叠一般在3cm以上。

● 通过位置鉴别,回结肠套叠多发生在右上腹,小肠套叠多发生在中下腹部,阑尾炎多发生在右下腹部。

   阑尾炎同心圆似肠套叠同心圆。

● 肠梗阻:是肠道内容物无法通过肠道的一种疾病,导致的原因比较多,有单纯性肠梗阻、粘连性肠梗阻、绞窄性肠梗阻和不完全性肠梗阻等。

诊断技巧

● 首先需要着重查看右侧腹肠管的变化,一般肠道叠的超声直接表现为,大部分肠道叠在右侧腹可见混合回声区,横断面呈“同心圆”征,纵断面呈“套筒样”改变。

● 其次还应该观察套管内有无肿大淋巴结、息肉、肠重复畸形、美克尔憩室等引起肠套叠的继发因素。

● 最后除此之外,还需要观察近端肠管的扩张情况,明确肠壁水肿的严重程度以及肠间隙渗出液体的清亮程度,告知是否有肠穿孔的可能,为临床选择合适的治疗方案提供重要的参考。

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)

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  1. CONNECT:[ UseTime:0.000490s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000821s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000380s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000272s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000466s ]
  6. SELECT * FROM `set` [ RunTime:0.000184s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000509s ]
  8. SELECT * FROM `article` WHERE `id` = 476047 LIMIT 1 [ RunTime:0.000360s ]
  9. UPDATE `article` SET `lasttime` = 1775683001 WHERE `id` = 476047 [ RunTime:0.003341s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000229s ]
  11. SELECT * FROM `article` WHERE `id` < 476047 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000429s ]
  12. SELECT * FROM `article` WHERE `id` > 476047 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002358s ]
  13. SELECT * FROM `article` WHERE `id` < 476047 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002474s ]
  14. SELECT * FROM `article` WHERE `id` < 476047 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002078s ]
  15. SELECT * FROM `article` WHERE `id` < 476047 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004102s ]
0.086410s