【摘要】 目的 分析周围神经鞘瘤MRI表现与其相关神经解剖分区的关系。方法 回顾性分析13例经手术病理证实的周围神经鞘瘤的影像学资料,其中12例良性（2例多发）,1例恶性,共21个病灶（n=21）。结果 6例（n=6）起源于外周主神经干（颈丛、臂丛、骶丛、股神经、腋神经）的良性神经鞘瘤表现为长椭圆形（n=6）,肌肉萎缩征（n=1）.“靶征”（n=1）,而7例（n=15）起源于周围神经分支的神经鞘瘤多呈短椭圆形、梭形（n=13）,均未见到肌肉萎缩征,T₂WI显示“靶征”（n=1 4）;本组病例中有9例T₁WI显示脂肪包绕征,多为起源于周围神经主干的肿瘤,均可见受累神经“传入传出征”;除上述表现外病灶在MR上信号可不均质,偶有囊变,增强后“靶征”者花环样强化,其余病灶为斑片状不均匀中等或明显强化,1例恶性周围神经鞘瘤（MPNST）边界不清伴有骨质破坏。结论 周围神经鞘瘤的影像学表现有一定特征性,其周围神经的解剖分区特点对肿瘤的诊断有帮助,恶性可伴灶周水肿和骨质破坏。更多还原

【Abstract】 Objective To analyze the relationship between MRI findings of peripheral nerve sheath tumor and its related neuroanatomical partition.M ethods Thirteen cases imaging data of peripheral nerve sheath tumor confirmed by surgery pathology were retrospectively analyzed,including twelve cases of benign tumor（two cases of multiple tumor）;one case of malignant tumor,a total of21 lesions.Results Six patients（6 lesions） were benign schwannomas that originated from the peripheral nerve trunk which included the cervical plexus,sacral plexus,brachial plexus and axillary nerve with a long oblong shape（n=6）,muscle atrophy（n=1）,the target sign（n=1）.Whereas seven cases of schwannoma（15 lesions） originated from branches of peripheral nerve were short oval or spindle shape（n=13）,which did not exist the sign of muscle atrophy.14 lesions showed target sign on T₂WI;9 lesions showed fat wrapped around on T₁WI,and the affected nerve were visible in all cases.In addition to the above performances,most of lesions on MRI showed inhomogeneous,with cystic change occasionally.Those lesions which had " target sign" showed the wreath enhancement,and the rest of the lesions were inhomogeneous enhancement wildly or dramatically.The boundary was unclear and the bony destruction was found in one case of malignant peripheral nerve sheath tumor（MPNST）.Conclusion Imaging findings of peripheral nerve sheath tumor have some characteristics,and its related neuroanatomical partition features are helpful to the diagnosis of this tumor.Tumor which becomes malignant will have edema around it and accompany with bone destruction.更多还原