侧脑室内脑膜瘤的CT和MRI诊断

目的分析侧脑室内脑膜瘤的CT和MRI表现,以提高诊断准确性。方法回顾性分析8例手术病理证实的侧脑室内脑膜瘤的CT和MRI资料。结果肿瘤呈圆形或分叶状软组织肿块,CT平扫多呈稍高或高密度,MRI多表现为T1WI等信号、T2WI等高信号,除1例因肿瘤坏死致信号和强化不均匀外,余7例肿瘤密度、信号及强化较均匀;周围脑组织可见不同程度水肿。1例肿瘤稍向周围脑组织呈浸润性生长,病理诊断为恶性脑膜瘤。结论侧脑室内脑膜瘤的CT、MRI表现具有一定的特征性,结合临床资料可提高诊断准确性。

CT and MRI Diagnosis of Meningiomas of Lateral Ventricle

Objective:To study the CT and MRI manifestations of meningiomas in lateral ventricle.Methods:CT and MRI data in 8 patients with meningioma within lateral ventricles were analyzed retrospectively.Results:Lesions were shown as globular or lobulated soft-tissue mass lying within the trigone of the lateral ventricle.Edema in various degrees could be seen in the surrounding brain parenchyma.One tumor showed heterogeneous signal intensity and heterogeneous enhancement due to central necrosis.The other tumors showed wild hyperattenuation on CT plain scan,isointense on T_1WI,and slightly hyperintense on T_2WI,markedly homogeneous enhancement on post-contrast CT images or MR images.One tumor infiltrated slightly into the surrounding brain parenchyma which was proved to be malignant meningioma pathologically.Conclusion:Meningiomas of lateral ventricle have characteristic presentation on CT and MR imaging,and when combined with clinical data CT and MRI can elevate the accuracy of diagnosis.