侧脑室脑膜瘤的CT和MRI诊断

目的：提高侧脑室内脑膜瘤的CT和MRI诊断的正确性。材料和方法：本文收集了经手术和病理证实的侧脑室脑膜瘤16例。9例作CT检查，12例作MRI检查，其中5例同时作CT和MRI检查。结果：（1）侧脑室脑膜瘤具有典型的CT和MRI表现，即：病灶大多为类圆形（81．2％，13／16），体积较大，边界清晰。CT平扫为均匀略高密度影，增强呈均匀明显强化（77．8％，7／9）。MRI表现为T1WI呈等信号（75％，9／12）、低信号（25％，3／12），T2WI呈略高信号（41．7％，5／12）、等信号（50％，6／12）、低高混杂信号（8．3％，1／12），增强呈均匀强化（66．7％，8／12），和不均匀强化（33．3％，4／12）。可有囊变、坏死和钙化。可见瘤周脑实质水肿（43．8％，7／16）。（2）侧脑室脑膜瘤好发于20－60岁，女性多见，本组男女之比为3:13。（3）侧脑室脑膜瘤好发于侧脑室三角区。（4）16例侧脑室脑膜瘤病理类型均为纤维型。结论：侧脑室脑膜瘤根据其CT和MRI特点，结合临床和发病部位和发病年龄、性别，可以提高诊断正确率。其病理类型均为纤维型。

CT and TRI Diagnosis of Meningiomas of the Lateral Ventricles

Purpose: To improve the CT and MRI diagnostic accuracy of meningiomas of the lateral ventricles. Materials and Methods: Sixteen cases of meningiomas in the lateral ventricles proved by surgery and pathology were reported. Nine cases were evaluated with CT, 12 cases with MRI and 5 with both CT and MRI. Results: (1) Meningiomas of the lateral ventricles had characteristic CT and MRI appearances,such as most tumors were somewhat round (81. 2 %, 13/16), with bulky volume and clear boundary.On plain CT scan, the tumors were slightly hyperdense, on post- contrast CT image, enhanced homogeneously. The MRI findings were: The tumors appeared isointense(75 %, 9/12)or hypointense(25 %, 3/12)on T1WI, and slightly hrperintense(41. 7 %, 5/12)or isointense(50 %, 6/12) or hypointense (8.3 %,1/12) on T2WI, on post-contrast scans, MR image showed markedly homogeneous enhencement (66. 7%, 8/12) and inhomogeneous enhencement (33.3 %, 4/12), Other features included cystic component, calcification and peritumoral edema. (2)The tumors frequently occured in patients of 20-60 years old, female: male = 13: 3. (3) The tumors frequently occured in lateral ventricular atrium. (4) All cases were fibrous in pathology. Conclusion: The diagnosis of lateral ventricles meningioma depended on their CT and MRI appearances, specific tumor location and patient's age and sex.