Rathke囊肿的CT和MRI诊断探讨

The CT MRI diagnosis Rathke's cleft cyst

目的:对Rathke囊肿的CT和MRI特征进行分析,以提高该病的术前诊断正确率。方法:回顾性分析经手术与病理证实的22例Rathke囊肿的CT及MRI资料。结果:22例Rathke囊肿形态呈圆形或类圆形,19例位于鞍内,伴鞍上延伸5例,伴鞍底下陷7例,3例位于鞍上。高度从5～30 mm,多数在10～20 mm。CT平扫呈等密度8例、低密度4例、略高密度1例、混杂密度1例。增强后3例病灶无强化,3例可见囊壁的强化。MRI平扫时,TIWI呈低信号2例、等信号3例、稍高信号5例,高信号8例、混杂信号3例;T2WI呈高信号6例,稍高信号3例、混杂信号7例。增强14例看到囊壁的轻度或部分强化。结论:Rathke囊肿CT、MRI影像表现多样,与临床病史及其它检查相结合,可提高定性诊断价值。

Objective： CT and MRI characteristics of 22 patients＇ Rathke＇ s cleft cyst after surgery and clinical verification in Shanghai Huashan Hospital in 2003-2004 were analyzed, in order to improve the accuracy of preoperative diagnosis. Methods： A retrospective analysis of CT and MPd records of 22 cases with Rathke＇ s cleft cyst after surgery and clinical verificatian.Results：22 cases with Rathke cysts form assumes the circular or circular-like, 19 cases located within the saddle, with saddle extensions in 5 cases,with the subsidence in 7 cases,3 cases in the saddle. The height is from 5-30 ram, most from 10-20 ram.On plain scans, 8 eases appeam^d isedense, 4 case appeared hyodense, 1 cases appeared slightly hyperdense. 1 appeared mixed densities. After the increase in 3 cases, 3 cases without aggrandizement lesions seen bursa wall. When Saul T1WI, on MRI plain scans, hypointense in 2 cases, dight hyperintense in 5 cases and hyperintanse in 8 cases., mixed signals in 3 cases.T2WI increased siganal in 6 eases, slightly high signal in 3 cases, mixed signal in 7 cases. Enhancement MRI demonstrated light and part enhancement.Conclusion ：Rathke＇s deft cyst CT and MRI images show diversities, and the clinical history and other combined inspection can improve the diagnosis value.