Cystic mass in posterior cranial fossa presenting with sudden onset of trigeminal neuralgia

by Luciano Mastronardi, MD, PhD, Ettore Carpineta, MD, Raffaelino Roperto, MD, San Filippo Neri Hospital, Rome, Italy
Case Presentation

A 62 years old female, with a sudden onset of left trigeminal neuralgia (mainly 1st and 2nd branches) caused by a large cystic lesion of the left posterior cranial fossa, at the level of the root entry zone (REZ) of the 5th nerve.

On neurological examination she showed a slight gait ataxia and diminished sensation on the left hemiface (except for the third trigeminal branch). Other cranial nerves were in order.

* 1. What are the possible lesional locations?