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脑膜肿瘤 – 香港微創腦及脊椎神經外科手術中心

脑膜瘤 (Meningioma)​

脑膜瘤 (Meningioma)是排名第二常见的原发性颅内肿瘤,仅次于神经胶质瘤,占颅内肿瘤约15至24%。

脑膜瘤每年发生率约每十万人当中就有六人患上,且在任何年龄皆可能发生,尤其于30至50岁的成人,当中以女性居多,男女比率约为1比2。

脑膜瘤多数(95%)皆是良性,其生长缓慢,平均每年以1至2mm 或体积的3.6%的速度慢慢地生长,所以往往在病人脑内潜伏了颇长时间。

有报告认为,脑膜瘤出现早期症状平均为2.5年,更有少数的脑膜瘤患者有6年之久。由于生长速度缓慢,患者本身不易早期察觉,当出现症状时,肿瘤通常已经很大。

脑膜瘤患者的神经症状, 要视乎肿瘤的位置及神经受到压力的程度。肿瘤压迫亦可导致肿瘤周围的脑神经水肿,令到颅内压力增高。

脑膜瘤的种类及位置

最常见的症状有头痛、头晕、半边手脚麻痹或者乏力、步态不稳、视力迷糊、嗅觉或听觉障碍、性情转变、呕吐、癫痫、神经疼痛等等。

由于脑膜瘤是良性的肿瘤,完全切除便能根治。如肿瘤不能完全切除,部份切除来为神经减压力的手术,其效果亦很良好。部份切除手术后,再配合立体定位放射治疗,可治愈大多数的脑膜瘤。

一般而言,在大脑凸面表面的脑膜瘤,在安全及风险容许的情况下,脑神经外科医生会力争完全切除,以减少复发机会。但是如果肿瘤的位置属于危险区域(如位于:蝶骨翼内侧、眶、矢状窦、脑室、脑桥小脑角、视神经鞘或斜坡),完全肿瘤切除手术可能会有导致神经功能永久丧失之风险,医生便会选择部分肿瘤切除,为神经减压。

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