骶骨富于细胞神经鞘瘤8例临床病理分析

摘要

Purpose To investigate clinicopathologic fea-tures of sacral cellular schwanoma and the difference from sacral conventional schwanoma.Methods Eight cases of sacral cellular schwanoma were collected.Microscopic examination and immunohistochemistry were performed for studying the clinical feature,radiologic appearance,pathologic characteristic,immunophenotyping,differential diagnosis and postoperative prognosis.Results There were 5 females and 3 males,whose mean age was 46.4 years.The majority of patients complained of pain in sacrococcygeal region.Radiographically,there was an endosacral or endosacral and presacal mass.Histologically,cellular schwannoma was composed of spindle cells,arranged in interlacing fascicles without nuclear palisading and Verocay bodies.Antoni A and Antoni B were not seen overtly.The destruction of bone was found.Immunohistochemically,tumor cells were diffusely and strongly positive for S-100 protein and vimentin.The mean of Ki-67 index was 6％.Tumor recurrence of 4 cases occurred several years after initial surgical resection.The mean interval to recurrence was 6.5 years.Conclusion Sacral cellular schwanoma is a rare tumor.Compared with sacral conventional schwanoma,it shows different growth pattern and pathologic features.So pathological diagnosis of the tumor should be noted for clinical follow-up and treatment.%目的 探讨骶骨富于细胞神经鞘瘤的临床病理特点及与骶骨经典型神经鞘瘤的异同.方法 回顾性分析8例发生于骶骨的富于细胞神经鞘瘤的临床资料、影像学、病理学特征、免疫表型、鉴别诊断及预后.结果 8例中女性5例,男性3例,平均年龄46.4岁.临床上以骶尾部疼痛为主,影像学上表现为骶骨或骶骨及骶前肿块.镜下见富于细胞神经鞘瘤由梭形细胞组成,呈条束状、交织状排列,无明显栅栏状排列和“verocay小体”结构,未见明显束状区和网状区,伴有骨质破坏.免疫表型:瘤细胞S-100蛋白和vimentin均弥漫强阳性,Ki-67增殖指数3％～10％.8例中有4例为复发病例,平均复发时间6.5年.结论 骶骨富于细胞神经鞘瘤是一种少见肿瘤,由于其形态学和生长方式与骶骨经典型神经鞘瘤有一定的差异,故病理诊断时应将该肿瘤给予注明,以供临床随访、治疗.