The double PCL sign appears on sagittal MRI
images of the knee when a bucket-
handle meniscal tear (medial meniscus in 80%
of cases) flips towards the centre of the joint so
that it comes to lie anteroinferior to
the posterior cruciate ligament (PCL) mimicking
a second smaller PCL.

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Correct Answer- A
The CT severity index (CTSI)-described by Balthazar
Balthazar CT Severity Index
CT Grade
Score
eA. Normal-O
. B. Enlarged gland -1
. C. Peri-pancreatic inflammation- 2
.D. One fluid collection- 3
◦ E. Two or more collections-4
Necrosis Score
.
.30%-50%- (4)
.[>50% -(6)
Ref: ACR Appropriateness Criteria,Acute Pancreatitis.

Correct Answer- A
The CT severity index (CTSI)-described by Balthazar
Balthazar CT Severity Index
CT Grade
Score
◦ A. Normal-
.B Enlarged gland -1
. C. Peri-pancreatic inflammation-2
. D. One fluid collection- 3
. E. Two or more collections- 4
Necrosis Score
◦
.|30%-50%- (4)
.| >50% -(6)
Ref: ACR Appropriateness Criteria,Acute Pancreatitis

Empty thecal sac sign is seen in arachnoiditis.


Due to inflammation, there is clumping of nerve
roots and thecal sac appears empty on MRI of a
lumbar spine.

Best view for right lung is left anterior
oblique. For left lung it is right anterior oblique
Both these views are also used in coronary
angiography.


◦ Left anterior oblique view demonstrates the
maximum area of right lung field. However
left anterior oblique view is mainly used for
assessment of left and right ventricles, left
atrium and aortic window and aorta.
◦ Right anterior oblique view demonstrates the
maximum area of the left lung field. It is used
for assessment of pulmonary artery, right
ventricle and size of the left atrium.

Investigation shown for acute limb pain

Image Description:
The waveform shown is a triphasic Doppler waveform, typical of vascular studies.

✅ Correct Answer: b. Ultrasound Doppler

Explanation:

Ultrasound Doppler is the most commonly used non-invasive test for evaluating arterial or venous flow in limbs.

Triphasic waveforms indicate normal arterial flow.

Used in cases of limb ischemia, deep vein thrombosis (DVT), and peripheral artery disease (PAD).

Digital subtraction angiography is invasive.

Plethysmography measures volume changes.

MR angiography is expensive and not used first-line.