MRI MRI Anatomy and Pathology 3

Question 1

A 'blooming' artifact on gradient echo (GRE) MRI is caused by which substance?

Accepted Answer

Hemosiderin or calcification

Answer

Hemosiderin, calcium, and other susceptibility-inducing substances cause local field inhomogeneities that appear as signal loss blooming on GRE sequences.

Question 2

On MRI of the prostate using PI-RADS scoring, which sequence is the most dominant sequence for peripheral zone lesions?

Accepted Answer

Diffusion-weighted imaging (DWI)

Answer

DWI is the dominant sequence for peripheral zone lesion characterization in the PI-RADS v2.1 scoring system for prostate MRI.

Question 3

Which MRI finding is characteristic of a benign rotator cuff tear involving a full-thickness supraspinatus tendon rupture?

Accepted Answer

Fluid signal gap (T2 bright) extending through the full thickness of the tendon

Answer

A full-thickness tear shows fluid (T2 hyperintense) extending completely through the tendon from bursal to articular surface.

Question 4

On brain MRI, the hippocampus is best evaluated for atrophy (as in Alzheimer's disease) on which plane?

Accepted Answer

Coronal, especially perpendicular to the long axis of the hippocampus

Answer

Coronal T1-weighted images perpendicular to the long axis of the hippocampus provide the best visualization of hippocampal volume and atrophy.

Question 5

In MRI of the breast, a finding described as a 'rim-enhancing mass' on dynamic contrast imaging is most suspicious for:

Accepted Answer

Malignant lesion

Answer

Rim enhancement of a breast mass, indicating peripheral enhancement with central necrosis, is a suspicious finding associated with malignancy.

MRI - Magnetic Resonance Imaging Practice Test

MRI - Magnetic Resonance Imaging Practice Test

MRI MRI Anatomy and Pathology 3