Labyrinthitis ossificans

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  • 60-year-old patient presented with progresisve sensorineural hearing loss.
  • Cone beam CT showed subtle calcification within the scala tympani of the basal turn of the cochlea, which corresponded to loss of fluid signal on CISS.
  • The normal left side is shown for comparison.

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  • 50-year-old patient presented with progressive right sided sensorineural hearing loss.
  • Baseline scan showed very subtle loss of fluid signal and post-gadoliniujm enhancement in the scala tympani on the right.
  • On follow-up imaging 1 year later, CSF signal had further reduced with evidence of ossification on CT.