BCSE Diagnostic Imaging Interpretation 3

Question 1

On MRI of the knee, a 'bucket-handle' tear of the meniscus is best recognized by which imaging feature?

Accepted Answer

A displaced fragment within the intercondylar notch creating a 'double PCL sign'

Answer

A bucket-handle tear displaces the inner fragment into the intercondylar notch, producing a double PCL sign on sagittal MRI.

Question 2

Which CT finding best differentiates a hepatic hemangioma from hepatocellular carcinoma on contrast-enhanced CT?

Accepted Answer

Peripheral nodular enhancement in the arterial phase with progressive centripetal fill-in

Answer

Hemangiomas show peripheral nodular arterial enhancement with progressive fill-in on delayed imaging, while HCC shows arterial enhancement with washout.

Question 3

On a plain radiograph, which feature best distinguishes a pathologic fracture from a stress fracture?

Accepted Answer

An underlying lytic or blastic lesion at the fracture site

Answer

A pathologic fracture occurs through pre-existing bone disease, so identifying an underlying lesion at the fracture site is the key distinguishing feature.

Question 4

On CT pulmonary angiography (CTPA), which finding is most specific for pulmonary embolism?

Accepted Answer

A filling defect within an opacified pulmonary artery

Answer

A filling defect within a contrast-opacified pulmonary artery on CTPA is the direct and most specific sign of pulmonary embolism.

Question 5

On ultrasound, which finding is most diagnostic of a testicular torsion?

Accepted Answer

Absent or markedly decreased Doppler flow in the affected testis

Answer

Absent or significantly decreased intratesticular Doppler flow confirms testicular torsion and requires emergent surgical intervention.

BCSE - Basic and Clinical Sciences Examination Practice Test

BCSE - Basic and Clinical Sciences Examination Practice Test

BCSE Diagnostic Imaging Interpretation 3