Rare isolated trigeminal nerve sarcoidosis mimicking schwannoma.

Sarcoidosis is a granulomatous disorder of unknown etiology involving multiple organ systems. Isolated neurosarcoidosis is exceedingly rare. This case report presents isolated trigeminal nerve sarcoidosis mimicking schwannoma in a patient presenting with symptoms of trigeminal neuralgia. Neuroimaging revealed a mass associated with trigeminal nerve which prospectively thought to represent schwannoma. However, surgical pathology was consistent with sarcoidosis. Given great overlap in imaging characteristic of tumors in the Meckel's cave intraoperative frozen section biopsy may be considered to rule out an inflammatory lesion.