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Trigeminal palsy caused by triventricular hydrocephalus. A case report.

A case of left trigeminal palsy caused by triventricular hydrocephalus and completely recovered after ventriculo peritoneal shunt is reported. The case was studied by MR before and after the operation. Preoperative MR showed triventricular hydrocephalus with marked reduction of the left Meckel's cave. Following ventriculo peritoneal shunt the patient showed a complete recovery of the left 5th nerve palsy and NR showed the expansion of the left Meckel's cave. The authors suggest that the trigeminal palsy was due to intracranial hypertension probably associated to a weakness of the lateral wall of the left Meckel's cave. No similar case have been previously reported in the literature.