As it is the case with acoustic neuromas (vestibular schwannomas) these tumors grow from the insulating cells of neurons known as Schwann cells. The treatment algorithm of these tumors are similar to acoustic neuromas with the caveat that resection, sometimes even small biopsy of these tumors, usually leads to complete paralysis of the face. For this reason, we usually try conservative measures for treatment of these tumors. Because they have an incredibly low incidence (200 times less than acoustic neuromas), the data on management of these tumors is even more scares and treatment algorithm even more confusing for patients.
Images used with permission from Robert K Jackler