0:01

This patient was being evaluated for potential

0:03

dehiscence of the superior semicircular

0:05

canal because of vertigo.

0:07

When we were looking at the superior

0:09

semicircular canal, here we see the proximal portion of

0:13

it with the vestibule here.

0:15

And as we followed it up to look for

0:17

whether or not it was dehiscent,

0:19

we lost the appearance of the superior portion

0:24

of the superior semicircular canal,

0:26

and it came back down here.

0:28

But at its uppermost portion,

0:31

there was obliteration of the normal lumen

0:34

of that superior semicircular canal.

0:36

There was no evidence of dehiscence,

0:38

but we just sort of lost it. On the axial scan,

0:41

I think it's a little bit more clear.

0:43

If we continue up superiorly,

0:45

we have the two limbs of the superior semicircular

0:49

canal and follow the anterior limb.

0:52

We keep going higher and higher, and then, whoops,

0:56

we've lost

0:58

the anterior limb,

1:00

secondary to focal labyrinthitis ossificans

1:04

affecting the anterior limb of the

1:07

superior semicircular canal.

1:10

And that was demonstrated nicely on both axial as

1:14

well as on the coronal reconstructed plane.

Labyrinthitis Ossificans, Superior SCC

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