0:01

This is an older gentleman who had hearing

0:03

loss on the right side. On the CT scan,

0:08

if we start with our external auditory canal,

0:12

we have a normal caliber.

0:14

We come to the ossicles,

0:16

which the cochlea...

0:18

with the malleus and the incus look normal.

0:21

We have a good-looking

0:24

stapes.

0:25

We don't have any demineralization in the fistula

0:28

ante fenestram, so that's normal. Nice dense bone

0:31

around the cochlea. However,

0:33

we do see a small plaque of ingrowth of

0:38

bone in the basal turn of the cochlea.

0:41

And if we compare that to the contralateral side,

0:44

you see that it is not there.

0:46

So this is right-sided cochlear labyrinthitis ossificans,

0:53

and it is obstructing the round window.

0:57

So the round window,

0:58

which should lead into the basal turn of the cochlea,

1:01

has bony ingrowth that is preventing the transmission

1:07

of air or fluid vibration into the cochlea

1:13

by virtue of this cochlear basal turn

1:17

labyrinthitis ossificans.

Labyrinthitis Ossificans, Cochlear Turn

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