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Lesson
Inner Ear
49 topics, 3 hr. 16 min.
Inner Ear Preview
2 m.Inner Ear – Introduction
2 m.Anatomy of the Internal Auditory Canal (IAC)
8 m.Coronal Anatomy of the Inner Ear
4 m.Axial IAC Anatomy and Otospongiosis/Otosclerosis
6 m.Coronal IAC Anatomy and Facial Nerve Segments
6 m.MRI imaging techniques and cochlea aplasia
7 m.IAC Congenital Lesions & Syndromes - Summary
7 m.Cochlear Hypoplasia
8 m.Cochlear Nerve Deficiency, Pontine Tegmental Cap Dysplasia
5 m.Bilateral Cochlea Nerve Deficiency
5 m.Labyrinthine Dysplasia/Syndromes - Summary
10 m.Incomplete Partition Type 1
3 m.Incomplete Partition Type 2 – Summary
3 m.Bilateral Incomplete Partition Type 2
3 m.Mondini Malformation, Incomplete Partition Type II
2 m.Incomplete Partition Type II, Mondini Malformation, Semicircular Canal Abnormality
3 m.Vestibular Malformation
3 m.Enlarged Endolymphatic Sac
2 m.Incomplete Partition Type III – Summary
4 m.Down Syndrome – Summary
6 m.Down Syndrome, Semicircular Canal Deformity, Cochlear Aperture Stenosis
6 m.Down Syndrome, Aperture Stenosis
6 m.Cochlear Hypoplasia and Aperture Stenosis - Summary
4 m.Semicircular Canal (SCC) Dehiscence – Summary
4 m.Semicircular Canal (SCC) Dehiscence
3 m.Semicircular Canal (SCC) – Oblique Reformat
2 m.Inflammatory/Infectious Lesions of the Inner Ear - Summary
7 m.Labyrinthitis, Secondary to Otomastoiditis
3 m.Labyrinthine Fistula Mastoidectomy and Cochlea implant
3 m.Viral Labyrinthitis
3 m.Otospongiosis (Otosclerosis) - Summary
10 m.Bilateral Otospongiosis (Otosclerosis)
5 m.Bilateral Retrofenestral Otospongiosis
4 m.Bilateral Otospongiosis and SCC Dehiscence
3 m.Otospongiosis, Left Stapedectomy
3 m.Labyrinthitis Ossificans – Summary
11 m.Post Traumatic Labyrinthitis Ossificans
3 m.Labyrinthitis Ossificans, Cochlear Turn
2 m.Labyrinthitis Ossificans, Superior SCC
2 m.Unilateral Labyrinthine Ossificans
2 m.Petrous Apex Lesions
8 m.Right Cholesterol Granuloma
5 m.Intravestibular/Labyrinthine schwannoma
3 m.Labyrinthine Schwannoma
4 m.Left Side Labyrinthine/Vestibule Schwannoma
2 m.Endolymphatic Sac Tumor (ELST) – Summary
4 m.Endolymphatic Sac Tumor and VHL
4 m.Inner Ear Malignant Neoplasm and Trauma Closing Points
6 m.0:01
This is a companion case to the last one we
0:04
saw, in that the patient had hearing loss
0:07
on the left side.
0:09
We look at the thin section CISS image and again we see
0:13
the asymmetry in the vestibule on the right side where
0:17
it's bright, with the vestibule on the left side where
0:21
the high signal intensity endolymph and perilymph has
0:24
been replaced by soft tissue. On the post-gadolinium
0:28
enhanced scan, as you can see,
0:31
the vestibule shows contrast enhancement.
0:33
Here is the contralateral right normal
0:35
side which should not enhance.
0:37
Here we have enhancement of the vestibule in a
0:40
patient who has a labyrinthine schwannoma.
0:43
Once again,
0:43
we would be concerned about whether or not we had
0:46
pre-gadolinium enhanced T1-weighted scans that might
0:49
confirm that this is enhancement rather than fat
0:54
or blood products. And for that, once again,
0:57
the only way to do it without the pre-gad is to
1:00
do an axial reformat of the sagittal scan,
1:05
and then look for the vestibule.
1:08
Here's our cochlea.
1:10
Here's where we would expect to see the vestibule
1:13
and there is nothing bright there.
1:15
And hence we would conclude that
1:16
this represents enhancement.
1:18
This is a little trick of the trade for those people who
1:21
don't have protocols where they
1:23
do a pre-gad T1-weighted scan.
Left Side Labyrinthine/Vestibule Schwannoma
HIDEInteractive Transcript
0:01
This is a companion case to the last one we
0:04
saw, in that the patient had hearing loss
0:07
on the left side.
0:09
We look at the thin section CISS image and again we see
0:13
the asymmetry in the vestibule on the right side where
0:17
it's bright, with the vestibule on the left side where
0:21
the high signal intensity endolymph and perilymph has
0:24
been replaced by soft tissue. On the post-gadolinium
0:28
enhanced scan, as you can see,
0:31
the vestibule shows contrast enhancement.
0:33
Here is the contralateral right normal
0:35
side which should not enhance.
0:37
Here we have enhancement of the vestibule in a
0:40
patient who has a labyrinthine schwannoma.
0:43
Once again,
0:43
we would be concerned about whether or not we had
0:46
pre-gadolinium enhanced T1-weighted scans that might
0:49
confirm that this is enhancement rather than fat
0:54
or blood products. And for that, once again,
0:57
the only way to do it without the pre-gad is to
1:00
do an axial reformat of the sagittal scan,
1:05
and then look for the vestibule.
1:08
Here's our cochlea.
1:10
Here's where we would expect to see the vestibule
1:13
and there is nothing bright there.
1:15
And hence we would conclude that
1:16
this represents enhancement.
1:18
This is a little trick of the trade for those people who
1:21
don't have protocols where they
1:23
do a pre-gad T1-weighted scan.
Report
Description
Faculty
David M Yousem, MD, MBA
Professor of Radiology, Vice Chairman and Associate Dean
Johns Hopkins University
Tags
Temporal bone
Neuroradiology
Neoplastic
MRI
Head and Neck
Brain
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