Liver

Question 1

Liver abscess imaging

Answer 1

Low attenuating mass with irregular margins. Rim enhancing and surrounding oedema.

Question 2

FNH imaging

Answer 2

isoattenuating mass non con, arterial hypervascular and hypodense central scar, feeding arteriole

Question 3

Adenoma

Answer 3

hyperechoic on USS, hertergenous secondary to haemorrhage. CT - attenuation depends on lipid content - my have peripheral enhancement with centripetal progression

Question 4

Pathophys of gallstone formation

Answer 4

High concentration of pigments from Hb breakdown (haemolytic conditions)
Stasis of bile
Supersaturation of bile salts
mucin acts as a nidus for crystals
ratio of bile salts to cholesterol

Question 5

imaging of hemangioma

Answer 5

USS - well circumscribed homogenous mass, usually hyperechoic
CT hypodense, well demarcated mass. Peripheral nodular enhancement in early phase, followed by centripetal pattern/filling in late phase. Opacify after a delay of 3-4 minutes.