骶管内脊膜囊肿的MR诊断

目的　探讨骶管内脊膜囊肿的临床表现、MR诊断及鉴别诊断。方法　 2 5例骶管内脊膜囊肿 ,均经手术病理证实。其中男 9例 ,女 16例 ,年龄 18～ 56岁 ,平均 40 .3岁。所有病例均行MR检查。结果　囊肿位于骶管内 ,呈卵圆形 19例 ,长条状囊袋形 3例 ,不规则形 1例 ,串珠形 2例。囊肿境界清楚 ,囊壁菲薄 ,囊液信号与脑脊液信号相似 ,T1WI囊液呈均质性低信号 ,T2 WI囊液呈高信号 ,8例T2 WI囊液信号较脑脊液信号更高。其中 7例囊肿内于T1WI和T2 WI可见细条状神经根影。 8例增强扫描囊液、囊壁无增强。结论　MR是骶管内脊膜囊肿最佳的检查方法之一 ,正确认识其MR征象不仅能够准确诊断 ,而且可以指导临床治疗方案的选择。

Sacral Meningeal Cysts:Evaluation with MR Imaging

Objective To study the clinical manifestat ions, MR diagnosis and differential diagnosis of sacral meningeal cyst.Methods 25 patients with sacral meningeal cyst proved by operation and pathology, 9 cases of male, 16 cases of female; the age ranged fro m 18 to 56 years old, average age is 40.3. All cases were performed on MR examin ation. Results The shape of cysts in 19 cases were elliptic,long marsupial shape in 3 cases,irregular in 1 case,string shap in 2 cases.The edge of cysts is clear and the wall of cysts is very thin.MR signal in tensity of fl uid in sacral meningeal cysts exhibits similarity to cerebrospinal fluid,which s hows uniform low signal in T 1WI and high signal in T 2WI.There are 8 cases sc an whose MR signal of cysts fluid is much higher than that of cerebrospinal flui d in T 2WI. In 7 cases thin strip nerve root can be found through the cysts in T 1WI and T 2WI. The antrast enhancement was made in 8 cases and there were no any enhancement both in content and wall of cyst.Conclusion MRI is one of the best examing methods for dia gnosiing of sacral meningeal cyst. Correct mastery of MR manifestations can not only help to give right dignosis, but also provide guidance for choices of clini cal treatment.