Rathke囊肿17例MRI表现分析

目的: 探讨Rathke囊肿的MRI特点,提高其MRI诊断水平。方法: 对17例经病理证实的Rathke囊肿患者MRI平扫及增强扫描影像特征进行回顾性分析。结果: 17例病灶中,12例位于鞍内,4例位于鞍内及鞍上,1例位于鞍上;13例呈类圆形,4例为哑铃型。病灶均为囊性病灶,1例囊内有漂浮结节。6例呈T1WI低信号,T2WI高信号;8例为T1WI等信号,其中6例T2WI高信号,2例T2WI等信号;3例为T1WI高信号,T2WI高信号,增强后3例部分囊壁强化,囊内漂浮结节未见强化。结论: Rathke囊肿具有一定的MRI特点,病灶多位于鞍内或者鞍内鞍上,T1WI多为等或高信号,一般增强后不强化。结合该特点有助于在术前正确诊断。

MRI diagnosis of Rathke's cleft cyst:a report of 17 cases

Objective：To study the MR images of Rathke＇s cleft cyst so as to improve the diagnosis of this disease. Methods：The enhanced MR images of 17 patients with Rathke＇s cleft cyst were retrospectively analyzed. Results：The Rathke＇s cleft cyst was located in the intrasellar region in 12 cases, in both sella and superasellar regions in 4 cases and in the suprasellar region in 1 case. The lesions were ovoid （ 13/17 ） or dumbell shaped （4/17）, all of which were cystic. Intracystic nodule was found in 1 case. Six of the cases presented hypointense on T1WI and hyperintense on T2WIs ,8 cases isointense on T1WI and hyperintense on T2W1,2 cases isointense on T1WI and T2WI, and 3 cases hyperintense on T1WI and T2WI. Partial linear contrast enhancement on the cystic wall was seen in 3 cases,but no enhancement was found in the intracystic nodule. Conclusions：The MRI features of the Rathke＇s cleft cyst were as follows ： most of the lesions were located in the intrasellar region or involving both intra-and suprasellar regions, manifesting iso or hyper intensity on TIWI but no enhancement after contrast injection. These will be of help to the diagnosis of Rathke＇s cleft cyst before surgery.