Anterior displacement of the geniculate ganglion

Tomoyasu Tachibana, Yorihisa Orita, Kazunori Nishizaki

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)113-115
Number of pages3
JournalJournal of International Advanced Otology
Issue number1
Publication statusPublished - 2016


  • Displacement
  • Facial nerve
  • Geniculate ganglion
  • Surgical treatmen

ASJC Scopus subject areas

  • Otorhinolaryngology


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