Schwannoma of the trochlear nerve. Case report.

There are only seven reported cases of intracranial schwannomas originating from the cranial nerves innervating the extraocular muscles. The present case, an incidental finding at autopsy, is the third case of schwannoma of the trochlear nerve and the first to illustrate the morphological relationship between this tumor and nerve. Reported cases of schwannoma of the oculomotor and trochlear nerves are summarized in a table.