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Training Collections
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Black Friday Save 30%Practice-focused training programs designed to help you gain experience in a specific subspecialty area.
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Black Friday Save 40%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.
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Dr. Resnick's MSK Conference
BLACK FRIDAY SAVE 30%Learn directly from the MSK Master himself.
Lower Extremities MRI Conference
Musculoskeletal Imaging
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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
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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
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