This fissure is present in the developing fetal petrous temporal bone and is typically ossified by 24 weeks.
- 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
Once the diagnosis is established, attempts to surgically close the fissure can be planned.
- 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