摘要目的 探讨难治性癫痫相关脑肿瘤的临床病理学特征.方法 选择 2005年1月至2008年4月期间在首都医科大学宣武医院接受难治性癫痫致痫灶手术切除治疗并经病理诊断为脑肿瘤患者的临床、影像以及病理学资料35例进行回顾性分析.结果 35例患者的癫痫平均发病年龄为14.3岁,平均病程8.6年,94.3%(33/35)的患者经头颅核磁共振(MRI)检查可见异常信号表现.组织学分型:神经节细胞胶质瘤19例(WHO Ⅰ级13例,WHOⅡ级6例),胚胎发育不良性神经上皮瘤3例(WHO Ⅰ级),多形性黄色瘤型星形细胞瘤3例(WHO Ⅱ级),弥漫性星形细胞瘤(WHO Ⅱ级)、少突星形细胞瘤(WHO Ⅱ级)、血管中心性胶质瘤(WHO Ⅰ级)和脑膜血管瘤病各1例,另有6例病变的组织学形态介于胶质神经元错构性病变和混合性神经元-胶质肿瘤之间.上述肿瘤多位于颞叶(27/35),多数同时伴有局灶性皮质发育不良的双重病理改变.免疫组织化学染色可见CD34显著表达于神经节细胞胶质瘤等病例.结论 表现为难治性癫痫的脑肿瘤多为位于颞叶且生长缓慢的混合性神经元-胶质肿瘤.观察到一组形态学上介于错构性病变和混合性神经元-胶质肿瘤之间的具有过渡特征的病变,这些错构性病变和肿瘤在组织形态学上体现的连续性以及良好的生物学行为提示了它们具有相同或相似的发生来源和发病机制,由此提出胶质神经元混合性病变的疾病谱概念.

abstractsObjective To study the clinicopathologic features of brain tumors occurring in patients with medically intractable epilepsy. Methods The clinical, radiologic and pathologic features of brain tumors occurring in 35 patients with intractable epilepsy encountered during the period from January, 2005 to April, 2008 in Xuanwu Hospital were retrospectively reviewed. Results The mean age of seizure onset and duration of disease were 14.3-year-old and 8.6 years, respectively. Abnormal signals were observed in 94. 3% of cases (33/35) by magnetic resonance imaging. The histologic types of brain tumors included ganglioglioma (13/35, WHO grade Ⅰ and 6/35, WHO grade Ⅱ), dysembryeplastic neuroepithelial tumor (3/35, WHO grade Ⅰ), pleomorphic xanthoastrocytoma (3/35, WHO grade Ⅱ), diffuse astrocytoma (1/35, WHO grade Ⅱ), oligoastrocytoma (1/35, WHO grade Ⅱ), angiocentric glioma (1/35, WHOgrade Ⅱ) and meningioangiomatosis (1/35). The 6 remaining cases showed features seen in between glioneuronal hamartoma and mixed neuronal-glial tumor, Most of these tumors were located in the temporal lobe (27/35) and associated with focal cortical dysplasia. Immunohistochemical study showed a remarkable expression of CD34 in gangliogliomas. Conclusions Brain tumors in patients with medically intractable epilepsy are almost always benign and located in the temporal lobe. Most of them represent mixed neuronal-glial tumors and some show transitional features in-between glioneuronal hamartoma and mixed neuronal-glial neoplasm. The similar morphologic pattern and biological behavior of glioneuronal hamartoma and mixed neuronal-glial tumor may suggest a common pathogenetic mechanism.