视觉减退可由视交叉病变引起,对此临床及常规检查难以诊断,而MRI能清楚地显示视交叉及其周围解剖结构,有利于发现视交叉病变。本文就近年来的有关文献综述如下。 一、视交叉区的正常解剖 视交叉是视神经颅内段于脑底处联合而成的扁椭圆形结构,其横径约12mm,前后径8mm,厚4mm。颅 Visual loss may be caused by optic chiasm lesions, which clinical and routine examination difficult to diagnose, and MRI can clearly show the optic chiasm and its surrounding anatomical structure, is conducive to the discovery of optic chiasm lesions. This article summarizes the relevant literature in recent years as follows. First, the optic chiasm normal dissection Optic cross is the intracranial optic nerve in the brain at the flat bottom of the oval-shaped structure, the horizontal diameter of about 12mm, anteroposterior diameter 8mm, thickness 4mm. skull