恶性外周神经鞘膜瘤的CT和MRI表现

目的回顾性分析恶性外周神经鞘膜瘤的CT和MRI表现,提高对该病的诊断准确性。方法搜集恶性外周神经鞘膜瘤病人12例,术前均进行了CT或MRI检查。结果CT表现平扫上为等、低密度混合的软组织肿块影,外形不规则,边界清楚(n=9)或模糊(n=3);增强扫描时呈不均性强化,坏死区不强化。MRI表现边界模糊,信号混杂。T1WI序列上多与肌肉等信号(n=11),内示局灶性长T1信号影;T2WI抑脂序列上以略高信号为主,边界清楚(n=2)或模糊(n=10),内示局灶性长T2信号,周围软组织浸润表现为片状高信号;增强扫描时呈不均性强化。结论恶性外周神经鞘膜瘤的CT和MRI表现具有一定的特征性。

CT and MRI Manifestations of Malignant Peripheral Nerve Sheath Tumor

Objective To retrospectively analyse CT and MRI appearances of malignant peripheral nerve sheath tumor(MPNST),inorder to improve diagnostic accuracy of this disorder.Methods 12 cases with MPNSTs of reviewed,all of them were examined preoperatively by CT or MRI.Results CT appearances:iso-or hypo-dense soft tissue mass with irregular contour,definite(9 cases) or indefinite (3 cases) margin on plain scan,homogeneous enhancement and no enhancement in necrotic area after contrast media administration.MRI appearances:the lesions had mixed signal intensity and vague boundary,most lesions(11 cases) were isosignal intensity in comparison with muscle with small low signal intensity foci on T1WI,but showing slight high signal intensity on T2WI with definite (2 cases) or vague(10 cases) boundary and small highsignal intensity foci inside the lesions,homogeneous enhancement after Gdolinium administration.Conclusion The manifestations of CT and MRI of MPNSTs are of certain characteristics.