0:00

I wanted to demonstrate for you the proper positioning

0:04

of the oblique reformat in a patient who is being

0:07

considered for superior semicircular canal dehiscence.

0:11

So we have the axial sections here that are in

0:15

straight transaxial that the patient was scanned in.

0:19

But we want to look at the superior semicircular

0:22

canal for dehiscence.

0:23

For that, we would need to do an oblique,

0:26

either coronal or sagittal reformat.

0:30

So if we look at this patient in the oblique sagittal plane,

0:36

we want to put it in the plane perpendicular to the

0:39

plane of the top of the superior semicircular canal.

0:42

And as you can see here, that's what we've done,

0:45

we can adjust accordingly,

0:47

but this is the right plane for capturing the top of

0:53

the superior semicircular canal.

0:54

When you do that and we scroll,

0:57

you can see the limb of the superior semicircular canal come up,

1:02

and then in the plane oblique,

1:04

I'm sorry,

1:05

parallel to the plane of section,

1:08

you can see the absence of bone overlying the

1:12

superior semicircular canal in this example.

1:14

So, here it is right here.

1:16

You have a large section of the superior

1:19

semicircular canal that does not have a bony covering.

1:23

And this is generally treated with patching

1:27

of the dura overlying this region.

1:29

And there's any variety of different material that

1:32

they can use to create a separation of the inner ear

1:37

structures from the pulsations of the cerebrospinal

1:40

fluid back and forth.

Semicircular Canal (SCC) – Oblique Reformat

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