Neuroradiologic Cases

Question 1

neuro CT exams are usually performed without contrast with exceptions for what situations?

Answer 1

1. CTs of head and neck soft tissues looking for infection or malignancy
2. CT angiograms of the head and neck
3. CT venograms of head and neck

Question 2

in what situations would you use gadolinium contrast for MRI?

Answer 2

1. infection
2. primary tumors or metatstatic disease
3. demyelinating disease (MS)

Question 3

MRA head usually done with or without contrast?

Answer 3

without

Question 4

MRA neck and MRV usually done with or without contrast?

Answer 4

with

Question 5

CT vs MRI: for which is patient cooperation more important?

Answer 5

MRI

Question 6

CT vs MRI: which is more likely to cause allergic reactions via contrast?

Answer 6

CT

Question 7

acute intracranial hemorrhage is _____ while chronic hemorrhage is ____ on CT

Answer 7

bright; dark

Question 8

two most common causes of subarachnoid hemorrhage

Answer 8

trauma and ruptured aneurysm

Question 9

to look for an aneurysm on ___, contrast is needed. No contrast necessary for ___.

Answer 9

CTA; MRA

Question 10

may not see acute infarct on ___. if level of suspicion is high via clinical context, get an ___.

Answer 10

CT; MRI

Question 11

what is the most important role of CT in acute stroke workup?

Answer 11

to look for hemorrhage

Question 12

best MRI sequence to look for acute ischemic infarct is ______

Answer 12

DWI (diffusion weighted imaging)

Question 13

what is the most sensitive imaging modality to evaluate for an acute brain infarct?

Answer 13

MRI without contrast