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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
I want to compare and contrast the right side from
0:04
the left side on this patient who had left
0:06
sided sensorineural hearing loss.
0:09
In looking at the inner ear structures
0:12
on the right side,
0:15
the intralabyrinthine canal looks pretty good there's.
0:19
Nice cochlear aperture.
0:21
The medius of the cochlea looks fine.
0:23
We have the basal turn, we have the middle turn,
0:25
we have the apical turn.
0:26
We have a normal vestibule and relatively normal
0:30
looking lateral semicircular canals,
0:32
as well as posterior and superior
0:34
semicircular canals. Now,
0:37
if the patient has dramatic sensorineural
0:40
hearing loss that's unilateral,
0:42
we may end up getting an MRI scan to
0:44
look for a vestibular schwannoma.
0:46
So let's look on the left side,
0:47
which was the symptomatic side.
0:49
On the left side,
0:50
what we see is the residual of a fracture that went
0:54
across the internal auditory canal and also
1:00
went through and into the cochlea.
1:03
So here is the fracture plane that one sees
1:06
affecting the basal turn of the cochlea.
1:11
This patient, here's the fracture line again,
1:13
that you can see coming across the vestibule,
1:17
look at the lateral semicircular canal.
1:21
You see that it has bony obliteration of
1:25
labyrinthitis ossificans secondary to the fracture,
1:30
which led to a hemo labyrinth,
1:32
blood in the labyrinth.
1:34
So, as opposed to the more normal appearance of the
1:38
lateral semicircular canal on the right side,
1:40
which was not fractured, on the left side,
1:43
we see labyrinthitis ossificans affecting the lateral
1:48
semicircular canal secondary to a previous fracture.
1:53
This patient, by the way,
1:55
also has a soft tissue mass here over the cochlear
2:00
promontory that ended up being an epidermoid.
Post Traumatic Labyrinthitis Ossificans
HIDEInteractive Transcript
0:01
I want to compare and contrast the right side from
0:04
the left side on this patient who had left
0:06
sided sensorineural hearing loss.
0:09
In looking at the inner ear structures
0:12
on the right side,
0:15
the intralabyrinthine canal looks pretty good there's.
0:19
Nice cochlear aperture.
0:21
The medius of the cochlea looks fine.
0:23
We have the basal turn, we have the middle turn,
0:25
we have the apical turn.
0:26
We have a normal vestibule and relatively normal
0:30
looking lateral semicircular canals,
0:32
as well as posterior and superior
0:34
semicircular canals. Now,
0:37
if the patient has dramatic sensorineural
0:40
hearing loss that's unilateral,
0:42
we may end up getting an MRI scan to
0:44
look for a vestibular schwannoma.
0:46
So let's look on the left side,
0:47
which was the symptomatic side.
0:49
On the left side,
0:50
what we see is the residual of a fracture that went
0:54
across the internal auditory canal and also
1:00
went through and into the cochlea.
1:03
So here is the fracture plane that one sees
1:06
affecting the basal turn of the cochlea.
1:11
This patient, here's the fracture line again,
1:13
that you can see coming across the vestibule,
1:17
look at the lateral semicircular canal.
1:21
You see that it has bony obliteration of
1:25
labyrinthitis ossificans secondary to the fracture,
1:30
which led to a hemo labyrinth,
1:32
blood in the labyrinth.
1:34
So, as opposed to the more normal appearance of the
1:38
lateral semicircular canal on the right side,
1:40
which was not fractured, on the left side,
1:43
we see labyrinthitis ossificans affecting the lateral
1:48
semicircular canal secondary to a previous fracture.
1:53
This patient, by the way,
1:55
also has a soft tissue mass here over the cochlear
2:00
promontory that ended up being an epidermoid.
Report
Description
Faculty
David M Yousem, MD, MBA
Professor of Radiology, Vice Chairman and Associate Dean
Johns Hopkins University
Tags
Trauma
Temporal bone
Non-infectious Inflammatory
Neuroradiology
Head and Neck
CT
Brain
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