Hyrtl's fissure (also known as tympanomeningeal fissure) is a congenital infra-labyrinthic fissure. It is a very rare cause of spontaneous CSF ottorhoea.
- this can be diagnosed on axial slices and coronal reformations
- CT cisternography and radionuclide cisternography can diagnose this rare condition
- heavily T2 weighted images are helpful in diagnosis
- once the diagnosis is established attempt for closure of fissure can be planned through natural or synthetic materials
- 1. Jégoux F, Malard O, Gayet-Delacroix M et-al. Hyrtl's fissure: a case of spontaneous cerebrospinal fluid otorrhea. AJNR Am J Neuroradiol. 2006;26 (4): 963-6. Pubmed citation