【摘要】 目的 探讨颅内肿瘤脑脊膜转移的途径和MRI表现特点。方法 回顾性分析了24例资料完整的病例,把脑膜受侵犯分为硬脑膜-蛛网膜型、软脑膜-蛛网膜型和混合型3种类型。结果（1）脑脊膜受侵犯的MRI平扫阳性率为45.8%。其中脑膜受侵7例,平扫阳性率为33.3%。脊膜受侵犯者平扫阳性率为100%。（2）单纯脑部脑膜受侵犯20例,单纯脊膜受侵犯3例,1例为脑和脊膜均受侵犯。（3）8例表现为局限性受侵犯,16例表现为弥漫型脑脊膜受侵犯。（4）硬脑膜-蛛网膜型4例,软脑膜-蛛网膜型14例,混合型6例。（5）病灶信号特征,平扫T₁WI脑膜病灶呈稍低或等信号。T₂WI呈等稍高信号表现。增强后脑膜病灶均有明显强化,脊膜病灶呈中至高度强化。结论 MRI检查能较好地显示颅内肿瘤脑脊膜侵犯的病灶。更多还原

【Abstract】 Objective To explore the metastatic way of cerebrospinal meninges involved by intracranial tumours and corresponding findings on MRI.Methods 24 cases with meningeal involvement by intracranial tumors confirmed by pathology were retrospectively reviewed,including gliomas in 10 cases,glioblastomas in 3 cases,ependymomas in 5 cases,other tumors in 6 cases.The involved meninges were divided three types:type Ⅰ（both dura and arachnoid involved）;type Ⅱ（both pia and arachnoid involved） and type Ⅲ（mixed type）.Results（1）The positive rate in displaying involved cerebrospinal meninges on MRI plain scanning was 45.8%,including 33.3% meningeal involvement and 100% spinal meningeal involvement.（2） There were meningeal involvement in brain only in 20 cases,spinal meningeal involvement only in 3 cases,both brain and spinal meningeal involvement in 1 case.（3）8 cases were local invasion and 16 cases were diffuse invasion.（4）There were 4 cases in type Ⅰ,14 cases in type Ⅱ and 6 cases in type Ⅲ.（5） The lesions were slight hypointense or isointense on T₁WI and iso-or hyperintense on T₂WI.The meningeal lesions in brain were marked enhancement and moderate or obvious enhancement for spinal meninges after intravenous gadolinium.Conclusion Cerebrospinal meningeal involvements by intracranial tumours can clearly displayed by MRI.更多还原