The Journal of International
Advanced Otology
Clinical Report

Anterior Displacement of the Geniculate Ganglion


Clinic of Otolaryngology, Himeji Red Cross Hospital, Himeji, Japan


Department of Otolaryngology, Okayama University School of Medicine, Okayama, Japan

J Int Adv Otol 2016; 12: 113-115
DOI: 10.5152/iao.2016.1559
Read: 1565 Downloads: 744 Published: 03 September 2019


We present the case of a 34-year-old Japanese woman with cholesteatoma of the middle ear. During the operation, this patient showed an unusual position of the geniculate ganglion. We reviewed the computed tomography (CT) images targeting the ear of the present case after the operation. We found that the shortest ranges from the ampullated end of the superior semicircular canal to the geniculate ganglion fossa were 5.1 mm on both sides. We did not find any cases with obvious dislocation of the geniculate ganglion among the 67 cases for which we had performed tympanoplasty. Displacement of the geniculate ganglion is either extremely rare or typically unnoticed because this abnormality is asymptomatic. We speculated that the unusual position of the geniculate ganglion was due to an incomplete development of the tympanic tegmen. When surgical treatment such as decompression of the facial nerve or tympanoplasty is performed, close attention should always be paid to the anatomy of the facial nerve from the labyrinthine segment to the geniculate ganglion. In the present case, although connective tissues existed around the anterior epitympanic recess, we left this lesion to avoid iatrogenic facial palsy.  

EISSN 2148-3817