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28 Cards in this Set

  • Front
  • Back
how is each segment of the liver supplied
each segment has its own dual vasc inflow, biliary drainage, and vasc outflow
what comprises portal triad
bile duct
hepatic artery
portal vein
segments of liver:
what separates liver into r and left lobes
middle hepatic vein
ivc
gb fossa
segments of liver:
what segments are separated by the left hepatic vein
IV(a/b) is separated from II and III
segments of liver:
what segments are separated by the right hepatic vein
VIII and V are separated from VII and VI
segments of liver:
what segments are separated by the L portal vein
IVa (sup) is separated from IVb (inf)
II (sup) is separated from III (inf)
segments of liver:
what segments are separated by the R portal vein
VIII (sup) is separated from V (inf)
VII (sup) is separated from VI (inf)
what divides segments II and III
left portal vein
what divides segments IVa and IVb
left portal vein
what divides segments VIII and V
right portal vein
what divides segments VI and VII
right portal vein
what does the falciform ligament contain
ligamentum teres
nml HU of liver in unenhanced CT
40-70 HU
HU in relation to spleen
should be >= 10 HU than the spleen
diaphragmatic slips
infoldings of diaphragm that indent the normally smooth contour of the liver
what is best seen in arterial phase of liver ct
hypervascular lesions (hepatoma, carcinoid megs, focal nodular hyperplasia)
what is best seen in portal venous phase of liver ct
it is overall best phase to detect majority of lesions in liver
what is best seen in delayed phase
hemangioma
cholangiocarcinoma
when is delayed phase obtained
10-20 mins after contrast injection
how to identify liver steatosis on ct
liver is <= 10 HU than the spleen
where does focal fatty infiltrate most often occur
usually at areas supplied by third inflow systems
area surrounding GB fossa
ligamentum teres
porta hepatis
where does focal sparing usually occur
usually at areas supplied by third inflow systems
area surrounding GB fossa
ligamentum teres
porta hepatis
most common findings associated with steatosis
angulated margins of demarcation
slender fingers of nml tissue
no mass effect of BV displacement
rapid changing appearance over time
what HU are considered increased liver attenuation
75-140 HU
most common etiologies for increased liver attenuation
amiodarone toxicity (from iodine deposition)
hemochromatosis
definition of AAA
outer to outer diamter of aorta > 3cm
risk of AAA rupture
depends on size
<5 cm, 5%
>6 cm, 16%
> 7 cm, 76%
measurement of aneurysmal dilatation of iliac artery
>1.5 cm