RVT Cerebrovascular Anatomy and Disease 2

Question 1

Which vessel is most commonly responsible for a watershed infarct between the MCA and ACA territories?

Accepted Answer

Internal carotid artery stenosis

Answer

Vertebral artery occlusion

Answer

Posterior communicating artery aneurysm

Answer

Basilar artery thrombosis

Question 2

On duplex ultrasound, a post-stenotic flow pattern distal to a high-grade ICA stenosis is characterized by:

Accepted Answer

Tardus-parvus waveform with delayed systolic upstroke

Answer

High-resistance monophasic waveform

Answer

Reversed diastolic flow

Answer

Normal triphasic waveform

Question 3

The carotid siphon refers to the S-shaped segment of the internal carotid artery located in the:

Accepted Answer

Cavernous sinus within the skull base

Answer

Neck at the carotid bifurcation

Answer

Petrous temporal bone

Answer

Parapharyngeal space

Question 4

A patient with subclavian steal syndrome will demonstrate which finding on vertebral artery duplex?

Accepted Answer

Complete reversal of flow direction throughout the cardiac cycle

Answer

Antegrade high-velocity flow throughout systole and diastole

Answer

Monophasic low-resistance antegrade flow

Answer

Absence of Doppler signal bilaterally

Question 5

The normal intima-media thickness (IMT) of the common carotid artery in adults under 50 years is generally accepted as less than:

Accepted Answer

0.9 mm

Answer

0.5 mm

Answer

1.2 mm

Answer

1.5 mm

Question 6

Which collateral pathway opens when the ipsilateral ICA is occluded and the contralateral ICA is patent?

Accepted Answer

Anterior communicating artery

Answer

Posterior communicating artery

Answer

Ophthalmic artery retrograde flow

Answer

Basilar artery-to-MCA anastomosis

Question 7

Fibromuscular dysplasia (FMD) of the internal carotid artery most commonly affects which segment?

Accepted Answer

Mid-cervical ICA (C1-C2 level)

Answer

Proximal ICA just above the bifurcation

Answer

Cavernous ICA siphon

Answer

Petrous ICA