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阑尾炎的发病原因病因

来源:华人健康网 | 发布时间:2013-11-18 00:07:17 | www.chinesejk.com

  (一)发病原因

  (1)原发性慢性阑尾炎:其特点为起病隐匿,症状发展缓慢,病程持续较长,几个月到几年。病初无急性发作史,病程中也无反复急性发作的现象。

  (2)继发性慢性阑尾炎:特点是首次急性阑尾炎发病后,经非手术治疗而愈或自行缓解,其后遗留有临床症状,久治不愈,病程中可再次或多次急性发作。

  (二)发病机制

  虽然有人认为阑尾慢性炎症的病理有时不易肯定,但多数仍有较明确的改变。阑尾壁增生肥厚,呈纤维化和粗短坚韧,表面灰白色,阑尾系膜增厚、缩短和变硬,黏膜或浆膜下有血管周围淋巴细胞和嗜伊红细胞浸润,有的还可见到异物巨细胞存在。有时阑尾壁纤维化而致管腔狭窄,甚至闭塞成一索条与阑尾老化萎缩相似。狭窄和闭塞起自阑尾尖端向根部蔓延,如仅根部闭塞,远端管腔内可充盈黏液,形成黏液囊肿。阑尾慢性炎症后可以自行卷曲,或周围为大量纤维粘连所包围,管腔内存有粪石或其他异物。

(编辑:小鱼 )

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