脊髓转移瘤的MRI诊断

目的 探讨脊髓转移瘤(ISCM)的MRI特征及其病理机制,以提高对该病的认识.方法 搜集15例经手术病理证实及临床确诊的ISCM,回顾性分析其MRI表现.全部病例均行MRI平扫及钆喷替酸葡甲胺(Gd-DTPA)增强扫描.结果 15例转移瘤均为单发,位于颈髓3例,胸髓5例,胸腰段脊髓圆锥部7例.MRI表现:T1WI呈等信号12例,低信号3例;T2WI呈高信号14例.等信号1例;增强扫描肿瘤均呈明显强化,7例呈环形强化,4例结节状强化,4例不均匀强化.结论 ISCM的特征性MRI表现为脊髓内明显强化的环形或结节状病灶,结合临床病史可以明确诊断.

Magnetic resonance imaging-based diagnosis of intramedullary spinal cord metastases

Objective To investigate the features of intramedullary spinal cord metastases (ISCM) in magnetic resonance imaging (MRI) in relation to their pathological basis. Methods The MRI appearance in 15 clinically and pathologically established ISCM were reviewed retrospectively. Spin-echo sequence T1 weighted images and turbo-spin-echo sequence T2 weighted images were acquired from all the patients with intravenous injection of Gd-DTPA. Results All the 15 ISCM were displayed on MRI as solitary lesions. The lesions were located in the cervical spinal cord in 3 cases, in the thoracic spinal cord in 5 cases, and in the medullary cone in 7 cases. The ISCM displayed isointensity on T1-weighted images and hyperintensity on T2-weighted images, all showing marked enhancement with clear borders after intravenous Gd-DTPA injection. Conclusion ISCM presents with some characteristic findings in MRI and a definite diagnosis can be obtained by combining the investigation of the clinical history.