CNS Imaging

Question 1

At which vertebra does the trachea bifurcates?

Answer 1

T4

Question 2

Skull x ray indications

Answer 2

Bony abnormality - skeletal survey - radiopaque foreign bodies

Question 3

Modality of choice in blunt polytrauma

Answer 3

CT scan

Question 4

Better soft tissue characterization

Answer 4

MRI

Question 5

Fast scan

Answer 5

CT

Question 6

Used to detect areas of abnormal blood flow

Answer 6

Color doppler

Question 7

It has a disadvantage that it is non reducible

Answer 7

Ultra sound

Question 8

Head injuries are classified as

Answer 8

Closed - Penetrating

Question 9

Lentiform, lens shaped biconvex, lemon shaped

Answer 9

Extradural hematoma

Question 10

Crescent, moon shaped, concave, banana shaped

Answer 10

Subdural hematoma

Question 11

90% is arterial (middle meningeal artery)

Answer 11

Extradural hematoma

Question 12

Tear of the cortical veins

Answer 12

Subdural hematoma

Question 13

Which of the following commonly associated with skull fractures?

• Extradural hematoma.
• Subdural hematoma.

Answer 13

Extradural hematoma

Question 14

Common in infants and elderly (acceleration deceleration injuries)

Answer 14

Subdural hematoma

Question 15

Traumatic spondylolisthesis of the axis (as a result of hyperextension and distraction)

Answer 15

Hangman fracture

Question 16

Burst fracture of C1

Answer 16

Jefferson fracture

Question 17

Stroke of an onset time of 0-6 h to 24h is considered ?

• Hyper-acute.
• Acute.
• Sub-acute.
• Chronic.

Answer 17

A

Question 18

Stroke of an onset time of 24 h to 1 week is considered ?

Answer 18

Acute

Question 19

Stroke of an onset time of 1 to 3 weeks is considered ?

Answer 19

Subacute

Question 20

Stroke of an onset time of > 3 weeks is considered ?

Answer 20

Chronic

Question 21

The goal of CT of the brain in the acute clinical setting is to

Answer 21

Exclude intracranial hemorrhage

Question 22

Phases of ischemic stroke in CT

Answer 22

1- maybe normal within first 3-6 hs.
2- loss of insular ribbon sign.
3- Effacement of the lentiform nucleus. 
4- Hyper dense MCA.
5- Sulcal effacement.
6- Cytotoxic edema (develops by 6 hs).

Question 23

The most sensitive sequence for stroke imaging

Answer 23

Diffusion weighted imaging (DWI)

Question 24

Sensitive to restriction of brownian motion of extracellular water

Answer 24

DWI

Question 25

Which imaging modality has less risk and toxic effects to the kidneys?

• Brain MRI.
• Brain CT.

Answer 25

MRI (gadolinium contrast is better than the iodinated contrast)

Question 26

According to the ACR criteria, what should be done in case of new focal neurological defect of less than 6 hours and is suspected for stroke.

Answer 26

CT head without contrast to asses for hemorrhage or large infarct

Question 27

According to the ACR criteria, what should be done in case of new focal neurological defect of more than 6 hours and is suspected for stroke.

Answer 27

MRI head with and without contrast

Question 28

According to the ACR criteria, what is the gold standard test for a clinically suspected hematoma?

Answer 28

CT head without IV contrast

Question 29

Small infarcts of the distal distribution of the deep penetrating vessels is called

Answer 29

Lacunar infarcts (most are clinically silent)

Question 30

Hypo dense area + peripheral rim enhancement is most likely

Answer 30

Brain abscess

Question 31

The best imaging modality for multiple sclerosis

Answer 31

MRI

Question 32

Most common type of brain tumors

Answer 32

Glioblastoma multiforme

Question 33

The most common non glial cell tumor

Answer 33

Meningioma

Question 34

The most common cancer to metastasize to the brain

Answer 34

Bronchogenic carcinoma

Question 35

Lateral ventricles enlargement of the temporal horns is the best indicator for

Answer 35

Obstructive hydrocephalus