Abstract：
Objective: To investigate the clinicopathological characteristics, pathological diagnosis of Ewing\'s sarcoma of the central nervous system. Methods: Six cases of Ewing\'s sarcoma of the central nervous system diagnosed at the First Affiliated Hospital of Nanjing Medical University, Nanjing, China from 2015 to 2022 were collected. The clinical manifestations, histological morphology, immunophenotype and molecular genetics of these cases were analyzed. The related literature was reviewed. Results: There were four males and two females, with a male to female ratio of 2∶1. The onset age was 17-40 years, with a median age of 23 years. All 6 tumors were located in the spinal cord (2 cases of cervical vertebra, 1 case of thoracic vertebra, 2 cases of lumbar vertebra, and 1 case of sacral vertebra). The patients\' clinical manifestations were mostly lumbago, weakness and numbness of lower limbs/limbs. In 1 case, the tumor recurred and metastasized to the suprasellar region and the third ventricle. Microscopically, the tumor showed diffuse infiltrative growth. In some cases, the tumor was closely related to the spinal meninges. The tumor cells were arranged in sheet, lobular, thin-rope, and nest-like patterns. Homer-Wright rosette was visible. The tumor cells were small to medium in size, and most of them had scant cytoplasm. A few cells had clear cytoplasm. Some areas were rhabdoid. The tumor cell nuclei showed focal mild pleomorphism. The chromatin was uniform and delicate while the nucleoli were not obvious. Mitosis was commonly seen. The tumor was separated by fibrous connective tissue and may be accompanied by mucinous degeneration. Immunohistochemistry showed that all tumors were positive for CD99, NKX2.2, Fli1, ERG. ATRX, H3K27me3, INI1 and BRG1 were all retained. Immunohistochemical stains for EMA, GFAP and Olig2 were negative. The Ki-67 proliferation index was 30%-70%. EWSR1 break-apart FISH test was positive. Conclusions: Ewing\'s sarcoma is rare in the central nervous system and needs to be distinguished from a variety of neoplasms with primitive undifferentiated small cell morphology. Immunohistochemistry and molecular genetics may be required for a proper diagnosis.
目的： 探讨发生于中枢神经系统的尤因肉瘤的临床病理学特征、病理诊断。 方法： 收集南京医科大学第一附属医院2015—2022年间收治的经病理确诊的发生于中枢神经系统的尤因肉瘤6例，对其临床表现、组织学形态、免疫表型及分子遗传学改变进行分析总结，并复习相关文献。 结果： 6例患者中男性4例，女性2例，男女比例2∶1，发病年龄17~40岁，中位年龄23岁，6例均位于脊柱椎管内（颈椎2例、胸椎1例、腰椎2例、骶椎1例），临床表现多为腰痛、肢体乏力麻木疼痛，其中1例术后肿瘤复发转移至鞍上区及第三脑室内。镜下观察：肿瘤呈弥漫浸润性生长，部分病例肿瘤与脊膜关系密切，肿瘤细胞排列呈片状、小叶状、细条索、巢团结构，可见Homer-Wright菊形团；肿瘤细胞小至中等大，大多数细胞胞质稀少，少数细胞胞质透亮，部分区域肿瘤细胞呈横纹肌样，细胞核形规则，局灶轻度多形性，染色质均匀细腻，核仁不明显，核分裂象易见；肿瘤间质见宽窄不等的纤维结缔组织分隔，可伴黏液变性。免疫组织化学：肿瘤细胞均表达CD99、NKX2.2、Fli1、ERG；H3K27me3、ATRX、INI1、BRG1均保留；不表达上皮细胞膜抗原、胶质纤维酸性蛋白、少突胶质细胞转录因子2等；Ki-67阳性指数30%~70%。荧光原位杂交检测均存在EWSR1基因断裂重组。 结论： 尤因肉瘤发生在中枢神经系统部位少见，需与多种具有原始未分化小细胞形态的肿瘤鉴别，确诊需结合免疫组织化学及特征性的分子遗传学证据。.
目的： 探讨发生于中枢神经系统的尤因肉瘤的临床病理学特征、病理诊断。 方法： 收集南京医科大学第一附属医院2015—2022年间收治的经病理确诊的发生于中枢神经系统的尤因肉瘤6例，对其临床表现、组织学形态、免疫表型及分子遗传学改变进行分析总结，并复习相关文献。 结果： 6例患者中男性4例，女性2例，男女比例2∶1，发病年龄17~40岁，中位年龄23岁，6例均位于脊柱椎管内（颈椎2例、胸椎1例、腰椎2例、骶椎1例），临床表现多为腰痛、肢体乏力麻木疼痛，其中1例术后肿瘤复发转移至鞍上区及第三脑室内。镜下观察：肿瘤呈弥漫浸润性生长，部分病例肿瘤与脊膜关系密切，肿瘤细胞排列呈片状、小叶状、细条索、巢团结构，可见Homer-Wright菊形团；肿瘤细胞小至中等大，大多数细胞胞质稀少，少数细胞胞质透亮，部分区域肿瘤细胞呈横纹肌样，细胞核形规则，局灶轻度多形性，染色质均匀细腻，核仁不明显，核分裂象易见；肿瘤间质见宽窄不等的纤维结缔组织分隔，可伴黏液变性。免疫组织化学：肿瘤细胞均表达CD99、NKX2.2、Fli1、ERG；H3K27me3、ATRX、INI1、BRG1均保留；不表达上皮细胞膜抗原、胶质纤维酸性蛋白、少突胶质细胞转录因子2等；Ki-67阳性指数30%~70%。荧光原位杂交检测均存在EWSR1基因断裂重组。 结论： 尤因肉瘤发生在中枢神经系统部位少见，需与多种具有原始未分化小细胞形态的肿瘤鉴别，确诊需结合免疫组织化学及特征性的分子遗传学证据。.
摘要：
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