0:01

This is an example of a parotid adenocarcinoma.

0:06

There's nothing really that different about this

0:08

case other than the very large nature of it.

0:11

As you can see here with the infiltration around the venous

0:15

structures it does go into the pterygoid plate region on the

0:20

left side as well as along the pterygoid musculature.

0:24

So here is the normal pterygoid muscle.

0:27

And this is likely the medial pterygoid muscle.

0:29

This is the lateral pterygoid muscle.

0:31

So medial pterygoid muscle is infiltrated.

0:34

That makes it a higher grade tumor.

0:37

And you may also wonder about the signal

0:40

intensity of the marrow of the bone.

0:44

So here is the bone marrow darker signal intensity.

0:48

The bone marrow normal fat, bright in signal intensity.

0:52

And that involvement of the bone will convert this to

0:55

a T4a tumor involvement of bone by the mass.

1:02

It may even infiltrate the inferior alveolar canal which is a

1:06

branch of the fifth cranial nerve, the inferior alveolar nerve.

1:11

And this is showing irregular contrast enhancement.

1:17

This lesion was biopsied and was an adenocarcinoma.

1:20

You might wonder whether this is one that had been around a

1:24

long time as a pleomorphic adenoma and then converted

1:27

to an adenocarcinoma. But in any case,

1:30

by virtue of the bony involvement we call this a T4a

1:36

parotid malignancy.

Parotid Adenocarcinoma

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