A.神經(jīng)鞘瘤來源于神經(jīng)鞘細(xì)胞，神經(jīng)纖維瘤來源于神經(jīng)束膜、外膜或內(nèi)膜等支持細(xì)胞
B.神經(jīng)鞘瘤最常見部位為正中神經(jīng)干、尺神經(jīng)干、坐骨神經(jīng)及橈神經(jīng)，神經(jīng)纖維瘤可發(fā)生于神經(jīng)末梢或神經(jīng)干的任何部位
C.神經(jīng)鞘瘤多為單發(fā)，神經(jīng)纖維瘤可單發(fā)或多發(fā)，以多發(fā)者為常見
D.神經(jīng)鞘瘤之神經(jīng)纖維穿過瘤體，神經(jīng)纖維瘤之神經(jīng)纖維并不穿過腫瘤組織
E.神經(jīng)鞘瘤可與神經(jīng)纖維完整分離，而切除神經(jīng)纖維瘤必須切斷神經(jīng)纖維

A.Ⅰ級：指未分化細(xì)胞不足25％
B.Ⅱ級：指未分化細(xì)胞占50％
C.Ⅲ級：指未分化細(xì)胞占75％
D.Ⅳ級：全部為未分化細(xì)胞
E.Ⅴ級：全部為極幼稚細(xì)胞