0:01

So, how is mucoepidermoid carcinoma different

0:04

from pleomorphic adenoma?

0:06

It has those features of parotid gland masses that are

0:10

malignant, and those are irregular margins to the lesion.

0:16

Dark signal intensity on T2-weighted scan without that

0:19

little black border of a capsule that we see

0:22

with a pleomorphic adenoma, for example.

0:26

Low values on ADC mapping, and with gadolinium-enhanced

0:32

imaging, you may see perineural spread.

0:35

Here is again our second genu of the 7th cranial nerve,

0:39

the 7th cranial nerve coming out the stylomastoid foramen,

0:41

and the tumor that's growing up the 7th

0:44

cranial nerve into the temporal bone.

0:46

We want to make sure that it's not a schwannoma, but

0:49

schwannomas would enhance much more avidly and

0:52

generally are not as dark on the ADC values.

0:58

Another example of mucoepidermoid carcinoma.

1:01

Here we have intermediate signal intensity on T1-weighted

1:04

scan and very dark on the T2-weighted scan.

1:08

Must be biopsied. Must be biopsied.

1:12

Here we have one that's affecting the hard palate.

1:17

Here is the mass projecting into the maxillary antrum,

1:23

and curiously,

1:25

this lesion has elevated the floor of the maxillary

1:29

antrum and taken with it a mucus

1:31

retention cyst just above it.

1:33

This is post-gadolinium T1-weighted scan with the mass

1:37

in the hard palate growing through the bone,

1:41

through the floor of the maxillary antrum,

1:44

lifting up the mucus retention cyst.

1:46

This darker signal on T2-weighted scan and the bone

1:51

erosion would be the features that suggest a malignancy.

Malignancy Salivary Neoplasm Features - Summary

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