Training Collections
Musculoskeletal Imaging
Emergency Imaging
PET Imaging
Pediatric Imaging
Training Collections
Musculoskeletal Imaging
Emergency Imaging
PET Imaging
Pediatric Imaging
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
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