鞍旁常见占位性病变的MRI诊断

目的：探讨鞍旁常见占位性病变的MRI特点与诊断价值。资料与方法：回顾分析28例鞍旁常见占位性病变的MRI特点，其中海绵状血管瘤7例，脑膜瘤12例，神经鞘瘤5例，表皮样囊肿4例。结果：海绵状血管瘤呈长T1长T2信号；增强扫描非常显著均匀强化。脑膜瘤多呈等T1等T2信号，部分病灶T2WI周边呈等信号，内见片状低信号；增强扫描均明显均匀强化，可出现“脑膜尾征”。神经鞘瘤呈稍长T1长T2信号, 呈哑铃形跨中后颅凹，多发生囊变；增强扫描明显环形强化。表皮样囊肿平扫信号表现多样性，增强后不强化。结论：鞍旁常见占位性病变有其典型的MRI特点，MRI很大程度可做出正确的定性诊断。

Diagnosis of common cerebral masses lateral to the sella on MRI

Objective: To explore the characteristics and evaluation of common parasellar masses on MRI. Methods: The characteristics of 28 common masses lateral to the sella on MRI were reviewed. Seven cases cavernous hamangiomas, 12 cases meningiomas, 5 cases schwannomas and 4 case epidermoid cysts. Results: The cavernous hamangiomas showed homogeneously hypointense on T1WI and hyperintense on T2WI. The lesions were markedly enhanced. Most meningiomas showed isointense on T1WI and T2WI. Some lesions showed isointense in the periphery and hypointense in the center on T2WI. All the lesions were markedly enhanced and some lesions showed dural tail sign. The schwannomas showed slight hypointense on T1WI and hyperintense on T2WI. Most of them were of dumb-bell shape stretching between middle and posterior cranial fossa. Most lesions appeared cystic changes and had enhancement. The signals of epidermoid cysts were variable on plain scan. The lesions had no enhancement. Conclusion: The common masses adjacent to the sella have typical characteristics on MRI. The histology of masses can be accurately diagnosed on MRI.