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垂体瘤常见临床表现之二视力、视野障碍

来源:华人健康网 | 发布时间:2010-09-26 09:42:58 | www.chinesejk.com
视力、视野障碍: 微小垂体腺瘤体积很小,不会造成视神经和视交叉的压迫,故多无视功能障碍,个别病例出现视力减退、视野缺损,其机制可能是由于供应视神经视交叉和肿瘤的血管是同一血管,由于供应到肿瘤的血流较快呈高灌注状态,供应到视神经视交叉血液减少,从而后者出现缺血状态,因此发生视力、视野障碍.随着肿瘤长大,因视神经视交叉长短位置的不同,供应血管数量位置不同,肿瘤的生长方式和生长速度不同等因素,约60%-80%的病例出现不同程度地视功能障碍,双颞侧偏盲。根据视路纤维排列,首先受累的为颞下象限,呈束状缺损,随着肿瘤增大,依次出现颞上、鼻下、鼻上象限受累,以至全盲。红视野受损先于白视野。少数视交叉前置者,肿瘤向鞍后上方发展,可无视功能障碍。

(编辑:蔡旭旭 )

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