脉络膜裂囊肿的MRI诊断

MR diagnosis of choroidal fissure cyst

目的探讨MRI对脉络膜裂囊肿的诊断价值。方法回顾性分析19例脉络膜裂囊肿的MRI及临床表现资料。结果19例患者病灶均位于脉络膜裂内,均为单侧发病,左5例,右14例。轴面观察7例病灶位于颞叶深部脑实质内,12例与环池或四叠体池相连,边缘锐利,圆形、类圆形或不规则形;冠状面和矢状面观察所有病灶均位于脉络膜裂内,呈"纺锤形"或"双凸透镜形"。病灶大小4mm×5mm～28mm×26mm不等,均呈长T1长T2信号,FLAIR序列上为低信号,病灶周围无水肿。2例行钆喷替酸葡甲胺(Gd-DTPA)增强扫描后病灶未见明显强化。结论MRI对脉络膜裂囊肿具有重要的诊断价值。

Objective To explore the application value of MRI for choroidal fissure cyst, and to improve the understand- ing of its MRI manifestations and clinical findings. Methods MRI appearance and clinical data of 19 patients （9 males and 10 females, aged 1.5--80 years, mean age 35.4 years） with choroidal fissure cyst were retrospectively analyzed. The clini- cal symptoms included headache and dizziness （n= 17）, seizure （n= 1）, and blurred vision （n= 1）. Routine MRI scanning of axial, coronary and sagittal planes were used. Two patients underwent contrast-enhancement scanning. Results All le- sions located at the area of choroidal fissure unilaterally; 5 cases on the left side, and 14 cases on the right side. On axial view, 7 lesions located at the temporal lobe, 12 lesions linked with ambient cistern or quadrigeminal cistern, appeared round or round-like in shape or irregular shape. On coronary and sagittal view, all lesions appeared double-convex lens or spindle in shape, located at the choroidal fissure. The size of the cysts ranged from 4 mm×5 mm--28 mm×26 mm and long T1 and long T2 signal intensity, hypointensity in FLAIR sequence with no surrounding edema were found in the le- sions. No evidence of enhancement revealed in the two cases. Conclusion MRI is the optimal modality in diagnosing cho- roidal fissure cyst.