text: where is the cranial lesion that results in bitemporal hemianopia?   pituitary gland.  by the way, it's "hemianopsia"  addendum:  technically the lesion is at the optic chiasm, which sits directly above the pituitary gland.  by far, the most common lesion is a pituitary adenoma, but very rarely could it be a different chiasmal lesion called a craniopharyngioma.