Interactive Transcript
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.
© 2024 MRI Online. All Rights Reserved.