Radiologic-clinical correlation. Junctional visual field loss.

Nerve fibers originating in the retina follow a specific topographical arrangement in the optic nerve and chiasm. Compressive lesions at the junction of the intracranial optic nerve and optic chiasm can produce characteristic visual field defects. Optic nerve involvement at the junction of the optic chiasm results in unilateral visual field loss. If fibers from the inferonasal retina of the contralateral eye (Wilbrand’s knee) are involved, there will also be a superotemporal visual field defect in the contralateral eye. These defects can be produced by pituitary tumors, suprasellar meningiomas, supraclinoid aneurysms, craniopharyngiomas, gliomas, and other entities (1–4). We describe two patients with intracranial lesions and junctional visual field defects.