摘要
目的:探讨脉络膜裂蛛网膜囊肿的CT、MRI诊断价值。方法:经CT和MRI诊断为脉络膜裂蛛网膜囊肿的患者23例。CT轴位扫描18例,其中增强扫描4例,CT冠状扫描2例,MRI进一步检查14例;单独MRI检查5例。结果:23例病灶均位于两侧脉络膜裂区,发生于右侧15例,发生于左侧8例;均为单发病灶;最大者22mm×28mm,最小者直径5mm。轴位CT上病灶呈长卵圆形、圆形,与环池相连14例,CT值6～26HU,平均为11.4HU。MRI表现:冠状面呈“双凸透镜”形、卵圆形,矢状面呈卵圆形、“箭头样”表现;均呈长T1长T2信号,FLAIR序列示囊肿信号呈低信号。CT、MRI增强扫描均无强化表现。其中CT首次诊断而误诊为其他疾病10例,MRI误诊2例。结论:CT和MRI均可检出脉络膜裂蛛网膜囊肿,但在明确诊断和鉴别诊断方面,MRI优势明显。
Objective:To discuss the value of CT and MRI scans in the diagnosis of the arachnoid cyst in choroidal fissure.Methods:There were twenty-three cases of arachnoid cyst in choroidal fissure proved by CT and MRI.Axial CT scanning was applied in 18 cases,coronal CT scanning in 2 cases,enhanced CT scanning in 4 cases and 14 cases accepted further examination by MRI.5 cases were only examined by MRI. Results:All lesions located at the area of choroidal fissure,15 cases were in right and 8 cases in left.They all were single lesion.The size of the biggest lesion was 22mm×28mm and the diameter of the smallest was 5mm.CT findings were as follows:round or long egg shape was seen on axial imaging in 18 cases,14 cases communicated with ambient cisterna.CT values of the lesions were 6～20HU.MRI findings were as follows:lesions were displayed as double-convex lens shape or egg shape on coronal imaging and round shape or arrow-head shape on sagittal imaging.They all showed long T_1WI and long T_2WI signal.In FLAIR series,they showed low signal.All lesions were not enchanced.Conclusion:Arachnoid cyst in choroidal fissure could be detected on both CT and MRI,but MRI is better in diagnosis and differential diagnosis.
出处
《放射学实践》
2005年第6期531-533,共3页
Radiologic Practice
