Legend Axial and coronal CT temporal bone images demonstrate a large soft tissue mass centered in the region of the geniculate ganglion with abnormal soft tissue/fluid density extending into the middle ear cavity. There is marked thinning and bulging of the tegmen tympani. There is fluid opacification of the mastoid air cells and mild distortion of the ossicles. The cochlea and internal auditory canal appear intact. Also, note enlargement of the labyrinthine and mastoid (vertical) segments of the facial nerve canal and stylomastoid foramen.

Legend MR images demonstrates an avidly enhancing lobular mass in the region of the geniculate ganglion of the facial nerve, with extension into the lateral IAC and along the tympanic and mastoid segments of the 7th nerve . There is fluid opacification of the middle ear cavity and mastoid air cells. Key words: ct mri temporal bone tumor neoplasia

ENT Diagnosis: Plexiform neurofibroma of the facial nerve