A Girl Without a Chiasm: Electrophysiologic and MRI Evidence for the Absence of Crossing Optic Nerve Fibers in a Girl With a Congenital Nystagmus

Abstract

An otherwise healthy 15-year-old girl with a congenital nystagmus was evaluated at our department using visual evoked potential recording and magnetic resonance imaging. She appears to have the unique isolated inborn absence of the optic chiasm, described only once before in two unrelated girls. Unlike these previously described cases, our patient does not seem to display a see-saw nystagmus.