室管膜下巨细胞星形细胞瘤的MRI诊断

目的 研究室管膜下巨细胞星形细胞瘤（SGCA）的MRI表现，探讨MRI对该病的诊断价值。资料与方法 回顾性分析经手术病理证实的9例SGCA的临床资料和MRI表现，其中男4例，女5例，年龄4．23岁，平均12．9岁。全部病例术前均行MRI平扫和增强检查。结果 所有肿瘤均位于侧脑室孟氏孔附近，3例呈类圆形，6例呈轻度分叶状。平扫T1WI为等或稍低信号，T2WI为等或稍高信号，9例均可见肿瘤周边点状或结节状钙化信号，2例肿瘤内部可见长T1、长T2小囊状信号；增强扫描，肿瘤呈明显均匀或不均匀强化。7例可见室管膜下结节，3例可见皮质结节。结论 SGCA的MRI表现有一定特征性，有助于术前诊断。

MRI Diagnosis of Subepengdymal Giant Cell Astrocytoma

Objective To study MRI findings of subependymal giant cell astrocytoma and evaluate its diagnostic value in subependymal giant cell astrocytoma.Materials and Methods Clinical data and MRI findings in 9 patients of subependymal giant cell astrocytoma (4 male and 5 female; ranging in age from 4 to 23 years old; mean age: 12.9 years) with pathologically proved were retrospectively analyzed. Pre and post MR scans were performed in all patients.Results All tumors were located near the foramen of monro, 3 patients were round like and 6 patients were slightly lobulated in shape. The tumors were appeared iso or hypointensity on T_1WI and iso or hyperintensity on T_2WI, there were punctate or nodular calcifications in the border of the tumors in all cases, and small cystic changes in the center of the tumors in 2 patients. After injection of contrast agent, the tumors were markedly homogeneous or heterogeneous enhancement. Subependymal nodules were seen in 7 patients, and cortical tubers were observed in 3 patients.Conclusion The MRI findings of subependymal giant cell astrocytoma are characteristic, which play an very important role in making a correct preoperative diagnosis.