The tympanomastoid fissure is one of the intrinsic fissures of the temporal bone, located parallel and posterior to the bony external auditory canal, dividing the tympanic part of the temporal bone and mastoid process. Its radiological significance is as a fracture mimic (pseudofracture) 1. Its surgical significance is as a commonly used palpable landmark to localize the facial nerve trunk during parotidectomy or repair after facial trauma 2.
- 1. Som PM, Curtin HD. Head and Neck Imaging. (2011) ISBN: 9780323053556
- 2. Pereira JA, Merí A, Potau JM, Prats-Galino A, Sancho JJ, Sitges-Serra A. A simple method for safe identification of the facial nerve using palpable landmarks. (2004) Archives of surgery (Chicago, Ill. : 1960). 139 (7): 745-7; discussion 748. doi:10.1001/archsurg.139.7.745 - Pubmed