骶椎神经源性肿瘤MRI诊断

MRI Diagnosis of Sacral Neurogenic Tumors

目的 了解骶椎神经源性肿瘤的MRI表现特征。资料与方法 回顾性分析经手术病理证实的 2 1例骶椎神经源性肿瘤的MRI表现。结果 良性肿瘤 17例 (神经鞘瘤 14例 ,神经纤维瘤 3例 ) ,其中位于S1～ 3 者 11例 ,位于S2～ 5和S3～ 5者分别为 2例和 4例 ;14例累及骶孔 ,骶孔有扩大 ;16例为实性 ,T1WI呈略低～低信号 ,T2 WI呈较高～高信号 ,病变的实性部分均有显著强化 ;1例为囊性。神经节成神经细胞瘤、原始神经外胚层瘤、成神经细胞瘤和恶性神经鞘瘤各 1例 ,前两者位于骶孔 ,后两者分别累及S2～ 5和S1～ 5,均有骨质破坏。结论 MRI可清楚地显示神经源性肿瘤的部位和范围 。

Objective To study MRI characteristics of sacral neurogenic tumors.Materials and Methods MRI findings of sacral neurogenic tumors in 21 patients were retrospectively analyzed.Results Benign tumors were seen in 17 cases, including neurilemoma (n=14) and neurofibroma (n=3). The benign tumors were separately located at S 1～3 (n=11), S 2～5 (n=2) or S3~5 (n=4). Sacral foramen involvement was seen in 14 cases. Of 17 cases, the lesion was solid in 16, which presented as slightly low to low signal on T1WI and slightly high to high signal on T 2WI. The remaining one was a cystic lesion. Malignant tumors occurred in 4 cases, including ganglioneuroblastoma (n=1), primitive neuroectodermal tumor (n=1), neuroblastoma (n=1) and malignant neurilemoma (n=1). Bone destruction was seen in all malignant tumors.Conclusion MRI can well display the site and extent of sacral neurogenic tumors, and qualitative diagnosis can be correctly made on MRI in most cases.