Abstract：
Meningioma originating from the oculomotor nerve without dural attachment in children has been rarely reported. A 6-year-old patient presented ptosis of the right eye for 5 years. MRI indicated an occupying lesion in the right cavernous sinus. A tumor originating from the oculomotor nerve without dural attachment was found during subsequent surgery and confirmed as meningioma by pathology. Subsequently, the tumor was removed completely, and the oculomotor nerve was reconstructed using the sural nerve. The patient\'s symptoms were relieved partially after 3 months. The findings of this case suggested that the mechanisms underlying meningioma involve ectopic arachnoid cap cells within the nerve sheath. Thus, the tumor should be removed completely; also, nerve reconstruction is suggested.
摘要：
儿童起源于动眼神经而没有硬膜附着的脑膜瘤很少报道。一名6岁的患者出现右眼下垂5年。MRI提示右侧海绵窦占位。在随后的手术中发现了源自动眼神经的无硬膜附着的肿瘤，并经病理证实为脑膜瘤。随后，肿瘤被完全切除,用腓肠神经重建动眼神经。3个月后患者症状部分缓解。这种情况的发现表明，脑膜瘤的机制涉及神经鞘内的异位蛛网膜帽细胞。因此，肿瘤应该完全切除；同时，建议进行神经重建。
