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