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.
0:01
Outside of the globe,
0:02
we usually think about orbital anatomy
0:05
in three different spaces.
0:07
The intraconal space, with the cone representing the muscles,
0:12
the conal space of the muscles.
0:15
And then, we have the extraconal space.
0:18
And there is different pathology that occurs in each of these spaces.
0:23
So, let's start with the intraconal spaces, the space
0:27
inside the muscle cone. This includes orbital fat,
0:32
arteries and veins, and various nerves, which include the
0:36
optic nerve as the dominant nerve of the orbit.
0:39
The oculomotor cranial nerves, three, four, and six.
0:45
And then, there are also branches of the fifth cranial nerve.
0:49
In this diagram, we can analyze the orbit
0:52
in terms of the various spaces.
0:54
That space, which is within the muscle cone,
0:59
is the intraconal space.
1:00
We consider the muscles themselves
1:03
part of the conal space.
1:05
And this is seen both on the axial diagram to the
1:08
right and the coronal diagram to the left.
1:11
And we have our inferior rectus muscle,
1:15
our medial rectus muscle, lateral rectus muscle,
1:19
superior rectus muscle, superior oblique muscle.
1:22
And this muscle above the superior rectus
1:25
muscle is the levator palpebrae muscle.
1:28
Outside the muscle cone is the extraconal space.
1:32
And as you can see, this includes orbital fat and bone,
1:36
as well as, more medially,
1:38
the paranasal sinuses.
1:39
And the paranasal sinus,
1:41
which leads to the most orbital pathology,
1:45
is the ethmoid sinuses, seen here.
1:49
Superficially, we also have an extraconal space.
Anatomic Considerations: Orbital Spaces
HIDEInteractive Transcript
0:01
Outside of the globe,
0:02
we usually think about orbital anatomy
0:05
in three different spaces.
0:07
The intraconal space, with the cone representing the muscles,
0:12
the conal space of the muscles.
0:15
And then, we have the extraconal space.
0:18
And there is different pathology that occurs in each of these spaces.
0:23
So, let's start with the intraconal spaces, the space
0:27
inside the muscle cone. This includes orbital fat,
0:32
arteries and veins, and various nerves, which include the
0:36
optic nerve as the dominant nerve of the orbit.
0:39
The oculomotor cranial nerves, three, four, and six.
0:45
And then, there are also branches of the fifth cranial nerve.
0:49
In this diagram, we can analyze the orbit
0:52
in terms of the various spaces.
0:54
That space, which is within the muscle cone,
0:59
is the intraconal space.
1:00
We consider the muscles themselves
1:03
part of the conal space.
1:05
And this is seen both on the axial diagram to the
1:08
right and the coronal diagram to the left.
1:11
And we have our inferior rectus muscle,
1:15
our medial rectus muscle, lateral rectus muscle,
1:19
superior rectus muscle, superior oblique muscle.
1:22
And this muscle above the superior rectus
1:25
muscle is the levator palpebrae muscle.
1:28
Outside the muscle cone is the extraconal space.
1:32
And as you can see, this includes orbital fat and bone,
1:36
as well as, more medially,
1:38
the paranasal sinuses.
1:39
And the paranasal sinus,
1:41
which leads to the most orbital pathology,
1:45
is the ethmoid sinuses, seen here.
1:49
Superficially, we also have an extraconal space.
Report
Description
Faculty
David M Yousem, MD, MBA
Professor of Radiology, Vice Chairman and Associate Dean
Johns Hopkins University
Tags
Orbit
Neuroradiology
Neuro
MRI
Infectious
Head and Neck
CT
© 2024 Medality. All Rights Reserved.