Radiology

Question 1

3 Causes of a mass in a cavity on chest X-ray with an air crescent?

Answer 1

Blood clot
Fungal aspergilloma in a TB cavity
Necrotic tumour

Question 2

Which borders are obscured in opacification of different lung lobes

Answer 2

Right heart border - middle lobe

Right diaphragm- lower lobe.

Question 3

Differential of central fluffy opacification?

Air Alveologram

Answer 3

Pulmonary oedema
Acute respiratory distress syndrome

Massive aspiration (causes pneumonitis)

Question 4

Cause of calcified hilar lymph nodes in a chest xray

Answer 4

1. Sarcoid
2. Old TB
3. Treated lymphoma

Question 5

When might a chest mri be of use?

Answer 5

To look for a thymol in myasthenia gravis

Pancoast tumour

Question 6

Round peripheral masses forming an obtuse angle with the lung wall (continuous with the pleura on cxr) differential?

Answer 6

Mesothelioma 
Pleural metastases (likely adenocarcinoma)

Neurofibroma

Question 7

What’s the only indication for cervical soft tissue xray?

Answer 7

Suspected foreign body- fish bone etc

Question 8

When do you do a FAST scan (focused assessment sonography for trauma)?

Answer 8

If patient is bleeding, but you don’t know where, so deciding whether to transfer them to CT or straight to theatre.

Generally full body CT is nearly always used for trauma otherwise

Question 9

What is the difference between a mass or nodule on CXR?

Answer 9

Mass >3cm

Nodule <3cm

Question 10

What defines a small or large pnuemothorax on CXR?

Answer 10

Small <2cm

Large >2cm

Question 11

How is staging imaging modality different for bowel cancer that presents in the bowel vs the rectum?

Answer 11

Rectum- MRI as pelvis is difficult to image

Bowel- CT

Question 12

In a suspected stroke, what findings might you see on CT Head?

Answer 12

Loss of grey-white matter differentiation

Dense MCA sign (no contrast but artery is bright white, as clotted)