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WHO I 级脑膜瘤是良性的,大约 80% 的脑膜瘤是 WHO I 级的良性脑膜瘤,这些脑膜瘤生长缓慢,手术切除后预后较好。
\n\nWHO I 级脑膜瘤一共包括 9 个亚型,分别是脑膜上皮细胞型、纤维(纤维母)细胞型、过渡细胞(混合细胞)型、砂粒体型、微囊型、富于淋巴细胞型、血管瘤型、化生型、分泌型。
\n\n对于 WHO I 级的脑膜瘤,手术切除后的复发率较低,完全切除后的 10 年无进展生存率是 60%~80%,部分切除后的 10 年无进展生存率则大约为 50%。
\n\n有 20% 左右的脑膜瘤并不是良性的,是高级别的脑膜瘤,其中 10%~18% 是介于良恶性之间的 WHO II 级脑膜瘤,而有大约 2%~4% 是恶性的 WHO III 级脑膜瘤。
\n\n高级别的脑膜瘤具有更加侵袭性的生物学行为,表现为生长速度快,手术切除后容易复发,甚至可能转移到身体其他部位,而且对于常规的治疗方法并不敏感。
\n\nWHO II 级脑膜瘤包括 3 个亚型,分别是脊索样型、透明细胞型和非典型脑膜瘤。WHO II 级脑膜瘤手术切除后复发率比 WHO I 级脑膜瘤要高,完全切除后的 5 年无进展生存率为 60%~90%,而部分切除的 5 年无进展生存率则为 30%~70%,10 年无进展生存率仅为 17%。
\n\nWHO III 级是恶性脑膜瘤,也包括 3 个亚型,分别是乳头型、横纹肌样型和间变型脑膜瘤。WHO III 级的恶性脑膜瘤手术后复发率最高,完全切除后的 5 年无进展生存率为 28%,而部分切除的 5 年无进展生存率为 0[2]。
\n\nWHO 的脑膜瘤病理分级是根据组织形态学的分类,病理分级越高则恶性程度越高。但是 WHO 病理分级并不能回答具体哪些脑膜瘤会复发,而且同一个脑膜瘤的病理分级并非永远一成不变,少数良性的脑膜瘤可以发生恶性病变,进展到高级别的恶性脑膜瘤。
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