枕骨大孔区脑膜瘤的MRI诊断

MR imaging diagnosis of meningioma at foramen magnum

目的探讨MRI对枕骨大孔区脑膜瘤的诊断价值,提高对枕骨大孔区脑膜瘤的MRI及临床表现的认识。方法回顾性分析经手术病理证实的11例枕骨大孔区脑膜瘤的MRI及临床表现,所有患者均行MRI平扫及增强扫描。结果11例共发现枕骨大孔区脑膜瘤11个,圆形、类圆形及不规则分叶状,直径2.2cm×2.6cm×1.3cm～6.5cm×5.2cm×4.5cm不等,T1WI上多为等信号或略低信号,T2WI上多为等信号或高信号,增强后均显著强化,6例可见典型的"脑膜尾"征。结论MRI对枕骨大孔区脑膜瘤具有重要诊断价值。

Objective To explore the diagnostic value of MR imaging for the foramen magnum meningiomas, and to improve the understanding of their MR imaging manifestations and clinical characteristics. Methods MR imaging and clinical data of 11 patients with foramen magnum meningiomas proved by operation and pathology were analyzed retrospectively. All patients underwent plain scanning and contrast - enhanced scanning of MR imaging. Results All patients were detected nodular or occupying lesions in the foramen magnum by MR imaging. The size of the lesions ranged from 2.2 cm ×2.6 cm ×1.3 cm to 6.5 cm× 5.2cm ×4.5 cm, and appeared round, round - like or irregular lobulation in shape. All lesions manifested isointensity or slightly low intensity in T1 WI and isointensity or high intensity in T2WI,and revealed obvious enhancement,classic meningeal tail sign in 6 cases. Conclusions MR imaging is the optimal modality in diagnosing the foramen magnum meningioma.