0:01

We just saw an example of incomplete partitian type

0:04

one where we really didn't have any evidence of a

0:08

mediolis in the cochlea, and it looked kind of bulbous.

0:12

And in that example, we saw a cystic cochlear

0:15

vestibular vestibule structure in

0:19

incomplete partitian type two.

0:22

We have a better development of the mediolis,

0:26

but it has incomplete spiralization of the cochlea.

0:30

And that is one of the findings that we

0:33

typically call Mondini malformation.

0:36

Now the eponym Mondini malformation has been fused

0:39

into the incomplete partitian type two.

0:43

Here is an example from Traboulsi's article in

0:47

Neurographics in which she identifies the abnormal

0:53

spiralization of the cochlea. We have a basal turn,

0:57

but the middle and apical turns are not developed, and

0:59

we don't see the mediolis associated with it.

1:03

Here again, basal turn of cochlea.

1:05

And then we have this blob for the second

1:08

and third turns of the cochlea.

1:11

And this is associated with enlargement

1:15

of the vestibular aqueducts.

1:16

So these are the vestibular aqueducts.

1:18

As you heard previously,

1:19

I said that we usually compare the caliber of the

1:23

vestibular aqueduct with the caliber

1:25

of the semicircular canals.

1:27

And when it is larger than the caliber

1:29

of the semicircular canals,

1:32

we consider it enlarged.

1:34

You can use one and a half millimeters as another of

1:38

the guides to an enlarged vestibular aqueduct.

1:42

Here is another example of incomplete partitian type

1:45

two associated with enlarged vestibular aqueduct.

1:49

This dilated structure here,

1:51

here's one of our semicircular canals, and you can

1:54

see that this is a portion of the cochlea.

1:56

We'd have to scroll down, but in this case,

1:59

the patient did have cochlear dysplasia as well.

Incomplete Partition Type 2 – Summary

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