There is mass effect with superior displacement of the optic chiasm. 双侧视交叉上抬。
Visual field changes suggested a mass within the left optic nerve extending its compression across the chiasm and encroaching on the left optic tract. 连续的视野变化显示视传导路径前部有肿瘤压迫现象，并且向原先定位的左侧视神经迅速地朝视交叉和视径移转。
