Bilateral internuclear ophthalmoplegia due to hydrocephalus: a case report.

We report a case of bilateral internuclear ophthalmoplegia due to hydrocephalus associated with Arnold-Chiari malformation. The bilateral internuclear ophthalmoplegia in this case was probably caused by brain stem displacement due to hydrocephalus. This patient was considered to have "arrested" hydrocephalus on the basis of the clinical and computed tomographic findings and the results of the continuous intraventricular pressure monitoring. However, the bilateral internuclear ophthalmoplegia gradually improved after ventriculoperitoneal shunting.