Training Collections
Library Memberships
On-demand course library with video lectures, expert case reviews, and more
Fellowship Certificate™ Programs
Practice-focused training programs designed to help you gain experience in a specific subspecialty area.
Ultimate Learning Pass
Unlock access to our full Course Library and all self-paced Fellowships.
Noon Conference (Free)
Get access to free live lectures, every week, from top radiologists.
Case of the Week (Free)
Get a free weekly case delivered right to your inbox.
Dr. Resnick's MSK Conference
Learn directly from the MSK Master himself.
Lower Extremities MRI Conference
Musculoskeletal Imaging
Emergency Imaging
PET Imaging
Pediatric Imaging
For Training Programs
Supplement your training program with case-based learning for residents, registrars, fellows, and more.
For Private Practices
Upskill in high growth, advanced imaging areas.
Emergency Call Prep
Prepare trainees to be on call for the emergency department with this specialized training series.
Training Collections
Library Memberships
On-demand course library with video lectures, expert case reviews, and more
Fellowship Certificate™ Programs
Practice-focused training programs designed to help you gain experience in a specific subspecialty area.
Ultimate Learning Pass
Unlock access to our full Course Library and all self-paced Fellowships.
Noon Conference (Free)
Get access to free live lectures, every week, from top radiologists.
Case of the Week (Free)
Get a free weekly case delivered right to your inbox.
Dr. Resnick's MSK Conference
Learn directly from the MSK Master himself.
Lower Extremities MRI Conference
Musculoskeletal Imaging
Emergency Imaging
PET Imaging
Pediatric Imaging
For Training Programs
Supplement your training program with case-based learning for residents, registrars, fellows, and more.
For Private Practices
Upskill in high growth, advanced imaging areas.
Emergency Call Prep
Prepare trainees to be on call for the emergency department with this specialized training series.
Lesson
Orbital Imaging Protocols
4 topics, 10 min.
Lesson
Orbit Anatomy
10 topics, 19 min.
Lesson
Case Review - Ocular Pathology
17 topics, 1 hr. 11 min.
Anterior Globe Rupture with Laterally Dislocated Cataract
4 m.Foreign Body in Globe
4 m.Wood Foreign Body and Ocular Hypotony
2 m.Hemmorhage in Both Chambers, Open Globe
3 m.Staphyloma
4 m.Persistent Hyperplastic Primary Vitreous (PHPV)
5 m.Retinal Detachment
3 m.Retinoblastoma on CT
4 m.Retinoblastoma on MRI
9 m.Bilateral Retinoblastoma
7 m.Ocular Pathology - Review
11 m.Endophthalmitis
3 m.PHPV Review, Coloboma, and Staphyloma
5 m.Phthisis Bulbi, Macrophthalmia, and Microphthalmia
4 m.Ocular Calcification
4 m.Retinoblastoma - Review
5 m.Choroidal Melanoma
3 m.Lesson
Case Review - Intraconal Pathology
15 topics, 1 hr. 8 min.
Intraconal, Conal and Extraconal Anatomy
1 m.Intraconal Hemangioma
5 m.Venous Vascular Malformation
3 m.Optic Nerve Glioma, NF1
4 m.Optic pathway glioma (pilocytic astrocytoma)
4 m.Optic Neuritis, Multiple Sclerosis
6 m.Optic Neuritis, Multiple Sclerosis (2)
7 m.Neuromyelitis Optica Spectrum Disorder
5 m.Neuromyelitis Optica With Spinal Cord Involvement
3 m.Optic Nerve Sheath Meningioma
5 m.Bilateral Optic Neuritis, Leukemia
6 m.Intraconal Pathology - Review
11 m.Optic Neuritis - Review
5 m.Optic Nerve Glioma - Review
4 m.Optic Nerve Sheath Meningioma - Review
6 m.Lesson
Case Review - Conal Lesions
5 topics, 16 min.
Lesson
Case Review - Extraconal Injuries and Abnormalities
18 topics, 55 min.
Extraconal Pathology - Introduction
1 m.Periorbital Cellulitis & Abscess
4 m.Type 3 Orbital Infection
3 m.Solitary Fibrous Tumor
4 m.Langerhans Cell Histiocytosis
2 m.Juvenile Ossifying Fibroma
2 m.Perineural Spread of Squamous Cell Carcinoma
5 m.Proptosis from Extraosseous Extension of Prostate Metastasis
3 m.Orbital Floor Fracture
5 m.Orbital Floor Fracture with Muscle/Fat Herniation
4 m.Orbital Floor Fracture: Status Post Repair
2 m.Bilateral Orbital Fracture Repair
2 m.Periorbital Cellulitis - Review
5 m.Orbital Pseudotumor - Review
3 m.Orbital Wall Abnormalities - Review
3 m.Orbital Fracture - Review
7 m.Giant Cell Reparative Granuloma
3 m.Granulomatous Sinusitis with IgG4-related Ophthalmic Disease
4 m.Lesson
Case Review - Orbital Appendage Pathology
6 topics, 19 min.
0:00
As with CT, the ocular membranes are not able to be
0:07
distinguished among themselves between
0:09
the retina and the choroid.
0:10
However, we do know that the sclera goes over the
0:14
anterior-most portion of the orbit
0:17
and the globe in the cornea.
0:20
Here we see the dark signal intensity lens.
0:24
And laterally, you may see a small dark structure which
0:28
represents the ciliary bodies and the muscles
0:31
that will tense and release the lens.
0:35
Behind the lens is the posterior segment
0:37
and is dominated by the vitreous.
0:40
And we see that both the vitreous humor as well as
0:43
the anterior chamber of the globe have
0:46
signal intensity which simulates CSF
0:49
on this T2-weighted image.
0:51
The muscles on T2-weighted scanning are going to be dark.
0:55
And here we have our lateral rectus muscle
0:58
and our medial rectus muscle.
1:00
Again, lateral rectus innervated by the abducens nerve or
1:03
cranial nerve six and the medial rectus muscle by
1:06
the oculomotor nerve or cranial nerve three.
1:10
Within the muscle cone,
1:12
the dominant structure is the optic nerve.
1:15
In this case, we see both the optic nerve,
1:17
which is cranial nerve two, as well as some of the
1:21
cerebrospinal fluid of the optic nerve sheath.
1:25
Now, the optic nerve sheath cerebrospinal fluid does
1:28
communicate with the intracranial cerebrospinal
1:31
fluid and can lead to infections going both directions.
1:37
In this situation,
1:38
we are also seeing the anterior clinoid process,
1:41
which is a piece of the bone of the lesser
1:43
wing of the sphenoid. And as you can see,
1:46
the optic nerve goes medial to the anterior
1:48
clinoid process in the optic canal.
1:52
Note also the close proximity of the ethmoid sinuses.
1:57
The ethmoid sinuses on T2-weighted scanning
2:00
when they are aerated or dark.
2:02
Here we see a little bit of mucosal thickening,
2:05
which is about normal thickness
2:08
in the ethmoid sinus.
Axial Anatomy on MRI
HIDEInteractive Transcript
0:00
As with CT, the ocular membranes are not able to be
0:07
distinguished among themselves between
0:09
the retina and the choroid.
0:10
However, we do know that the sclera goes over the
0:14
anterior-most portion of the orbit
0:17
and the globe in the cornea.
0:20
Here we see the dark signal intensity lens.
0:24
And laterally, you may see a small dark structure which
0:28
represents the ciliary bodies and the muscles
0:31
that will tense and release the lens.
0:35
Behind the lens is the posterior segment
0:37
and is dominated by the vitreous.
0:40
And we see that both the vitreous humor as well as
0:43
the anterior chamber of the globe have
0:46
signal intensity which simulates CSF
0:49
on this T2-weighted image.
0:51
The muscles on T2-weighted scanning are going to be dark.
0:55
And here we have our lateral rectus muscle
0:58
and our medial rectus muscle.
1:00
Again, lateral rectus innervated by the abducens nerve or
1:03
cranial nerve six and the medial rectus muscle by
1:06
the oculomotor nerve or cranial nerve three.
1:10
Within the muscle cone,
1:12
the dominant structure is the optic nerve.
1:15
In this case, we see both the optic nerve,
1:17
which is cranial nerve two, as well as some of the
1:21
cerebrospinal fluid of the optic nerve sheath.
1:25
Now, the optic nerve sheath cerebrospinal fluid does
1:28
communicate with the intracranial cerebrospinal
1:31
fluid and can lead to infections going both directions.
1:37
In this situation,
1:38
we are also seeing the anterior clinoid process,
1:41
which is a piece of the bone of the lesser
1:43
wing of the sphenoid. And as you can see,
1:46
the optic nerve goes medial to the anterior
1:48
clinoid process in the optic canal.
1:52
Note also the close proximity of the ethmoid sinuses.
1:57
The ethmoid sinuses on T2-weighted scanning
2:00
when they are aerated or dark.
2:02
Here we see a little bit of mucosal thickening,
2:05
which is about normal thickness
2:08
in the ethmoid sinus.
Report
Description
Faculty
David M Yousem, MD, MBA
Professor of Radiology, Vice Chairman and Associate Dean
Johns Hopkins University
Tags
Orbit
Neuroradiology
Neuro
MRI
Head and Neck
© 2024 Medality. All Rights Reserved.