鞍区囊性病变的MRI影像学表现

目的：探讨鞍区囊性病变的MRI影像学表现,以提高对此类病变的诊断水平。方法：37例鞍区囊性病变包括垂体腺瘤囊变16例、囊性颅咽管瘤5例、Rathke＇s囊肿5例、表皮样囊肿3例、蛛网膜囊肿5例、垂体脓肿3例。所有病例均行MRI平扫,其中32例行增强扫描。结果：鞍区病变以垂体瘤囊变最常见,主要表现为T1WI低信号,T2WI高信号,囊壁强化;颅咽管瘤、Rathke＇s囊肿信号较复杂,与囊内容物有关;蛛网膜囊肿、表皮样囊肿显示为与脑脊液信号;垂体脓肿增强扫描囊壁呈明显环形强化。结论：鞍区不同囊性病变具有一定MRI表现特点,结合临床病史多数病变可做出正确诊断。

MRI features of sellar regional cystic lesions

Objective：To investigate MRI characters of sellar regional cystic lesions and to improve accuracy in diagnosis.Methods：37 cases with sellar regional cystic lesions were performed MR plain scanning,and 32 of those patients were performed enhanced scanning. 31 cases were proved by operation and pathology,6 cases were proved by clinical data.Results：Cystic pituitary adenomas were the most common tumors of the sellar region. Cystic pituitary adenoma showed hypointense on T1WI and hyperintense T2WI. The MRI signal of cystic craniopharyngioma and Rathke cleft cyst were diverse. The MRI signal of arachnoid cyst and epidermoid cyst were similar with cerebral spinal fluid. Pituitary Abscess showed round enhancement in MRI.Conclusion：MRI diagnosis of sellar regional cystic lesions can be improved by observing MRI imaging characters and clinical data.