·臨床醫(yī)學(xué)圖像·
彌漫性軟腦膜膠質(zhì)神經(jīng)元腫瘤
圖1 光學(xué)顯微鏡觀察所見HE染色1a腫瘤細(xì)胞沿軟腦膜呈彌漫性生長×40 1b可見形態(tài)和大小較一致的少突膠質(zhì)細(xì)胞樣腫瘤細(xì)胞×200Figure 1 Optical microscopy findings HE staining Tumor cells grew diffusely along the leptomeninges(Panel 1a).×40 Oligodendroglial?like tumor cells with consistent form and size were seen(Panel 1b).×200
2016年世界衛(wèi)生組織(WHO)中樞神經(jīng)系統(tǒng)腫瘤分類定義一種罕見的膠質(zhì)神經(jīng)元腫瘤,以彌漫性軟腦膜病變?yōu)樘卣?,腫瘤細(xì)胞形態(tài)類似少突膠質(zhì)細(xì)胞,部分病例可見神經(jīng)元分化;存在BRAF基因融合及染色體1p缺失或1p/19q?共缺失,不存在異檸檬酸脫氫酶(IDH)基因突變。彌漫性軟腦膜膠質(zhì)神經(jīng)元腫瘤好發(fā)于兒童和青少年,組織學(xué)形態(tài)觀察,腫瘤組織由低至中等密度、相對單一、少突膠質(zhì)細(xì)胞樣腫瘤細(xì)胞組成,胞核大小一致、中等圓形、核仁不明顯,呈彌漫性或軟腦膜上小巢狀生長(圖1)。免疫組織化學(xué)染色,腫瘤細(xì)胞胞核表達(dá)少突膠質(zhì)細(xì)胞轉(zhuǎn)錄因子2(Olig?2);胞質(zhì)表達(dá)微管相關(guān)蛋白?2(MAP?2)、S?100蛋白(S?100)和突觸素(Syn),約50%病例表達(dá)膠質(zhì)纖維酸性蛋白(GFAP)且常局限于小部分腫瘤細(xì)胞;不表達(dá)上皮膜抗原(EMA)、神經(jīng)元核抗原(NeuN)和R132H?突變IDH1。
(天津市環(huán)湖醫(yī)院病理科閻曉玲供稿)
Diffuse leptomeningeal glioneuronal tumor
YAN Xiao?ling
Department of Pathology,Tianjin Huanhu Hospital,Tianjin 300350,China(Email:ll934065@126.com)
10.3969/j.issn.1672?6731.2017.02.014