視神經(jīng)膠質(zhì)瘤

視神經(jīng)膠質(zhì)瘤(optic nerve glioma)是發(fā)生于視神經(jīng)內(nèi)膠質(zhì)細(xì)胞的良性腫瘤。膠質(zhì)細(xì)胞是中樞神經(jīng)系統(tǒng)和神經(jīng)節(jié)的支持細(xì)胞。膠質(zhì)細(xì)胞分為星形膠質(zhì)細(xì)胞、少突膠質(zhì)細(xì)胞和小膠質(zhì)細(xì)胞，發(fā)生于視神經(jīng)內(nèi)的膠質(zhì)細(xì)胞瘤，幾乎均為星形膠質(zhì)細(xì)胞瘤，又因多發(fā)生于兒童時(shí)期纖維形星形膠質(zhì)細(xì)胞，故又名兒童纖維星形膠質(zhì)細(xì)胞瘤(juvenile pilocytic astrocytoma，JPA)。