| 赵英,戴敏方.磁共振增强扫描对颅后窝占位性病变 的诊断价值[J].中国医学影像技术,2003,19(1):15~17 |
| 磁共振增强扫描对颅后窝占位性病变 的诊断价值 |
| Diagnosis of Posterior Fossa Masses with Contrast-Enhanced MRI |
| 投稿时间：2002-06-01 |
| DOI： |
| 中文关键词: 颅后窝占位性病变 Gd-DTPA 磁共振增强扫描 |
| 英文关键词:Posterior fossa mass Gd-DTPA Contrast-enhanced MRI |
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| 中文摘要: |
| 目的 评价增强扫描对颅后窝占位性病变定性诊断及术后随访的价值。方法 回顾性分析38例颅后窝占位性病变的MRI平扫及增强表现,全部病例均经手术病理及临床证实。其中星形细胞瘤8例,髓母细胞瘤3例,血管母细胞瘤4例,转移瘤5例,脑膜瘤9例,脑脓肿2例,表皮样囊肿3例,蛛网膜囊肿4例。结果 血管母细胞瘤呈大囊小结节型,壁结节显著均匀强化,囊壁、囊液不强化;髓母细胞瘤实质强化较明显,内部囊变区较小;星形细胞瘤可呈实质性或囊实性,强化表现复杂;转移瘤及脑脓肿强化表现相似,可结合病史加以鉴别;脑膜瘤明显强化,并可显示"脑膜尾征";表皮样囊肿和蛛网膜囊肿不强化。9例患者术后进行了11次复查,1例诊断肿瘤残留复发,8例可见不同程度的术后改变。结论 MRI增强扫描能对大多数颅后窝占位性病变进行定性诊断,对临床治疗及术后随访具有较高的指导意义。 |
| 英文摘要: |
| Objective To evaluate Gd-DTPA-enhanced MRI in the diagnosis of posterior fossa masses and follow-up survey after operation. Methods MRI manifestations of 38 cases with occupied posterior fossa masses were reviewed.All cases were proved pathologically and clinically,and studied with Gd-DTPA,including astrocytoma in 8 cases,medulloblastoma in 3 cases,hemangioblastoma in 4 cases,metastatic tumor in 5 cases,meningioma in 9 cases,abscess in 2 cases,epidermoid cyst in 3 cases and arachnoid cyst in 4 cases. Results Imaging findings of posterior fossa masses were complicated.The hemangioblastomas had big cyst and small nodule.The nodules were homogeneous enhanced after injection of Gd-DTPA,and the cysts were not enhanced.The medulloblastomas were obviously enhanced,and cystic areas were small.The astrocytoma was materiality or cyst and solid.And it was heterogeneous after injection of Gd-DTPA.The metastatic tumor and the abscess were similar after enhanced,we could differentiate them by the disease history.The meningiomas were enhanced obviously,and could show the "meninges tail".The epidermis-kind cyst and the arachnoid cyst were not enhanced.Nine cases had 11 reexamination after operation,one case had postoperative recurrence and 8 cases had changes of operation. Conclusion Contrast-enhanced MRI can diagnose most of posterior fossa masses qualitatively. |
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