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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
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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
Pre-Course Activities
1 topic, 3 min.
Lesson
Introduction to Stroke Imaging
4 topics, 17 min.
Lesson
Noncontrast CT
5 topics, 14 min.
Lesson
CTA Neck
10 topics, 33 min.
Vascular Imaging in Stroke - CTA vs MRA
2 m.Carotid and Vertebral Vasculopathies Overview & Examples of Atherosclerotic Disease
3 m.Case - Atheromatous Disease with Severe ICA Stenosis
4 m.Carotid & Vertebral Artery Dissection Overview & Examples
3 m.Case - Embolic Stroke with ICA Dissection
5 m.Collagen Vascular Diseases Overview - Examples of FMD, Carotid Web
2 m.Case - Fibromuscular Dysplasia (FMD)
5 m.Case - Ehlers Danlos
7 m.Inflammatory Conditions with Stroke Symptoms - Examples of Takayasu's, TIPIC
4 m.Case - Takayasu’s Arteritis
4 m.Lesson
CTA Head
9 topics, 37 min.
CTA Head in Acute Stroke - Source Images, MIPS, Collaterals
4 m.Case - MCA Stem Embolus with Good Collaterals
5 m.Case - MCA Stem Embolus with Poor Collaterals
4 m.Case - Basilar Tip Thrombus
6 m.Circle of Willis Stenoses: Differential Diagnoses
2 m.Case - Moya Moya disease
6 m.Case - Reversible Cerebral Vasoconstrictive Syndrome (RCVS)
5 m.Case - Primary Angiitis of the CNS (PACNS)
7 m.Infectious Causes of Multifocal Circle of Willis Stenosis
2 m.Lesson
CT Perfusion
3 topics, 15 min.
Lesson
MRI (DWI, FLAIR, SWI) of Acute Stroke
3 topics, 14 min.
Lesson
MRA of Head and Neck
6 topics, 18 min.
Lesson
Multifocal Strokes With No Visualized Vascular Abnormality
6 topics, 26 min.
Lesson
Brain Ischemia, Hypoxia, & Death
6 topics, 16 min.
Lesson
Stroke Mimics & Other Causes of Restricted Diffusion
7 topics, 18 min.
Stroke Mimics - Other Causes of Restricted Diffusion
2 m.Case - Seizure (Stroke Mimic)
4 m.Case - MELAS (Stroke Mimic)
3 m.Case - Hypoglycemia (Stroke Mimic)
3 m.Case - Herpes Virus Encephalitis (Stroke Mimic)
4 m.Case - Osmotic Demyelination Syndrome (Stroke Mimic)
3 m.Case - Brain Metastases (Stroke Mimic)
4 m.Lesson
MR Perfusion
8 topics, 17 min.
MR Perfusion - Data, Maps and Uses
4 m.Case - MR Perfusion Target Mismatch (Good Collaterals)
2 m.Case - MR Perfusion Target Mismatch (Poor Collaterals)
3 m.Case - Ischemia Detected Only on MR Perfusion (Case 1)
2 m.Case - Ischemia Detected Only on MR Perfusion (Case 2)
3 m.Arterial Spin Labelling Perfusion - Usage Examples
3 m.Case - ASL Matched Defect
2 m.Case - ASL Showing Tissue at Risk
2 m.Lesson
Subacute Stroke & Differentials
5 topics, 13 min.
0:00
These are images of a 62-year-old male
0:03
who had right sided weakness.
0:05
And initially, he had a non-contrast CT,
0:07
and there's no hemorrhage.
0:09
It looks pretty normal.
0:10
Maybe there's some
0:12
minimal, if any,
0:14
abnormality in the left basal ganglia,
0:17
and don't really see a hyperdense vessel sign.
0:22
And then, he got a CTA.
0:25
And you can see on the CTA that there's
0:28
a cut off of this large M2 branch,
0:31
and they're pretty good collaterals.
0:33
So, that was the CTA.
0:34
So next, he got an MR.
0:37
And you can see on the DWI images
0:41
that there's a very small infarct involving the left
0:44
basal ganglia and corona radiata.
0:48
And it's dark on ABC images,
0:52
as you'd expect with an acute infarct.
0:54
On the FLAIR images,
0:57
there's really not much FLAIR abnormality
0:59
because it's very early.
1:00
There's no breakdown of blood-brain barrier,
1:03
and then there's some hyperintensity in vessels
1:06
all the way up over the cortex,
1:08
suggesting that there's maybe good collateralization.
1:12
So here's the DWI,
1:13
and then this is the transit time map,
1:17
the T max map that's thresholded,
1:19
and you can see there's a big mismatch between
1:21
the DWI and the delay in the transit time,
1:25
which is basically most of the superior division
1:28
of the left MCA.
1:30
Som MCA, M2 embolus,
1:34
big core penumbra mismatch,
1:37
good collaterals.
1:39
And so, this patient did go to thrombolysis.
1:43
So, here's the follow up DWI.
1:46
And you can see that here's the initial infarct,
1:50
and there's a little bit of extension
1:54
into the penumbra,
1:55
but most of it was spared with the
1:57
patient having thrombectomy.
Case - MR Perfusion Target Mismatch (Good Collaterals)
HIDEInteractive Transcript
0:00
These are images of a 62-year-old male
0:03
who had right sided weakness.
0:05
And initially, he had a non-contrast CT,
0:07
and there's no hemorrhage.
0:09
It looks pretty normal.
0:10
Maybe there's some
0:12
minimal, if any,
0:14
abnormality in the left basal ganglia,
0:17
and don't really see a hyperdense vessel sign.
0:22
And then, he got a CTA.
0:25
And you can see on the CTA that there's
0:28
a cut off of this large M2 branch,
0:31
and they're pretty good collaterals.
0:33
So, that was the CTA.
0:34
So next, he got an MR.
0:37
And you can see on the DWI images
0:41
that there's a very small infarct involving the left
0:44
basal ganglia and corona radiata.
0:48
And it's dark on ABC images,
0:52
as you'd expect with an acute infarct.
0:54
On the FLAIR images,
0:57
there's really not much FLAIR abnormality
0:59
because it's very early.
1:00
There's no breakdown of blood-brain barrier,
1:03
and then there's some hyperintensity in vessels
1:06
all the way up over the cortex,
1:08
suggesting that there's maybe good collateralization.
1:12
So here's the DWI,
1:13
and then this is the transit time map,
1:17
the T max map that's thresholded,
1:19
and you can see there's a big mismatch between
1:21
the DWI and the delay in the transit time,
1:25
which is basically most of the superior division
1:28
of the left MCA.
1:30
Som MCA, M2 embolus,
1:34
big core penumbra mismatch,
1:37
good collaterals.
1:39
And so, this patient did go to thrombolysis.
1:43
So, here's the follow up DWI.
1:46
And you can see that here's the initial infarct,
1:50
and there's a little bit of extension
1:54
into the penumbra,
1:55
but most of it was spared with the
1:57
patient having thrombectomy.
Report
Faculty
Pamela W Schaefer, MD, FACR
Professor of Radiology, Vice Chair of Education
Massachusetts General Hospital
Tags
Vascular Imaging
Perfusion
Neuroradiology
Neuro
MRP
MRI
Head and Neck
CTA
CT
Brain
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