其中1例患者，强化病灶局限于右侧视神经且延伸至视交叉前缘，其它部位均为受累（图8）。
In one case, the enhancement was confined to the right optic nerve, extending to the prechiasmal border without any other parenchymal involvement (Fig 8).
结论颅底肿物引起不同类型的视野缺损的原因与压迫视神经、视交叉相关。
Conclusion The compression of optic nerves and optic chiasma is responsible for different types of visual field defects caused by saddle area tumors.
目的为脑底肿瘤压迫视神经、视交叉引起视野缺损原因提供形态学依据。
Objective To provide morphological evidences for visual field defects caused by the compression of optic nerves and optic chiasma by saddle area tumors.
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