脑脉络膜裂MRI解剖研究及脉络膜裂囊肿影像分析

MRI anatomic study of choroidal fissure and imaging analysis of choroidal fissure cyst of brain

目的探讨脑脉络膜裂的MRI解剖学特点及脉络膜裂囊肿的CT和MRI表现。方法结合1例颅脑标本的解剖观察,分析90例20～50岁正常脑脉络膜裂的MRI表现并测量其宽度,同时分析20例脑脉络膜裂囊肿的CT和MRI表现。结果经颅脑标本解剖观察脑脉络膜裂呈"C"形裂隙,深处由室管膜封闭,侧脑室内的脉络丛附着于此裂隙并与之走行一致。脉络膜裂在MRI上为含脑脊液的线状裂隙,50岁前成人裂隙的宽度相差不大。脑脉络膜裂囊肿CT和MRI表现为脑脉络膜裂内类圆形或椭圆形的脑脊液密度或信号。结论了解脑脉络膜裂的解剖学特征及其正常MRI表现,对于脉络膜裂囊肿诊断具有重要意义。

Objective To study MRI anatomic characteristics of choroidal fissure of brain in vivo and the clinical significance and CT and MRI findings of choroidal fissure cyst. Methods MR images of ehoroidal fissures in 90 normal brains aged between 20 and 50 were retrospectively analyzed, combining with the anatomical observation of one cadaveric head. At the same time, MRI findings of 20 patients with ehoroidal fissure cyst in brain were observed. Results Gross dissection showed C-shaped choroid fissure of brain accompanied with lateral ventricle. Choroid fissures could be clearly shown on MRI, demonstrating the linear fissure full of cerebrospinal fluid and nearly the same width in adult before 50 years old. Choroid fissure cyst was displayed as round or oval loci of cerebrospinal fluid-like density or signal intensity in choroid fissure on CT or MR imaging. Conclusion The understanding of the anatomical characteristics of brain choroid fissure and normal MRI findings may be very significant for the diagnosis of choroidal fissure cyst.