【摘要】 目的 :探讨眼眶脑膜瘤的发生部位、MRI的信号特征及鉴别诊断。方法 :搜集经手术病理证实的眼眶脑膜瘤43例 ,行MRI扫描及增强脂肪抑制扫描 ,分析其发生部位与信号特征。结果 :依据眼眶脑膜瘤的发生部位分为下列 4种 :①视神经鞘脑膜瘤 ,肿瘤呈不规则管状软组织增生 ,环绕视神经生长 ,等信号、T2 WI及增强脂肪抑制成像显示肿瘤与视神经界限清楚。②眶壁 (内 )脑膜瘤 ,肿瘤呈宽基底等信号软组织块与眼眶壁紧贴 ,突向眶内 ,或位于肌锥内 ,边界清楚 ,增强明显。③蝶骨嵴脑膜瘤 ,肿瘤沿蝶骨嵴内外侧生长 ,向内侵犯眶内组织 ,向外累及翼腭窝。④眶颅沟脑膜瘤 ,肿瘤通过眶上裂、视神经管或骨质破坏缺损区呈哑铃形向眶内及颅内生长 ,等信号 ,增强显著。结论 :应用合适的MRI扫描技术 ,可清晰准确地显示眼眶脑膜瘤的范围、部位、形态及信号特征 ,为临床手术治疗提供明确的定位、定性信息和诊断依据更多还原

【Abstract】 Objective:To investigate the location,MR imaging features and differential diagnosis of orbital meningioma.Methods:43 cases of orbital meningioma confirmed by pathology were collected.The patients underwent high resolution MR imaging with contrast enhancement and fat saturation.The location and MRI features of the tumor were analysed. Results: According to the position of orbital meningioma,they could divided in four types:①Optic nerve sheath meningioma: irregular soft tissue mass,around the optic nerve,and there was sharp demarcation between neoplasm and optic nerve on T 2WI and enhanced imaging.②Orbital wall (intraorbital) meningioma:the tumor clinged to orbital wall with broad basis and appeared isointense,it was within orbit and well defined with marked enhancement.③Sphenoid ridge meningioma:the neoplasms grew along the sphenoid ridge and they invaded tissues of the orbita,involved the pterygopalatine fossa. ④Cranio orbital communicating meningiomas:they grew between the orbital cavity and the cranial fossa through optic canal or superior orbital fissure.Conclusion:Correct MRI scanning technique can show the extent,position,shape and signal character of orbital meningioma clearly,which could contribute to diagnosis and differential diagnosis and provide valuable information for determining treatment measures and surgical approach.更多还原