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Metastases to liver features onmalignancy. Most commonly from colon. Target appearance. Hypervascular (carcinoid, choriocarcinoma, pheochromocytoma, RCC, thyroid cancer). Some cystic/nectrotic, calcification
Most common liver CT?
HCC CT features?
50% solitary tumor 30% infiltrative 20% multinodular Small tumors, < 3cm bright homogeneous enhancement Necrosis and calcification common Invasion of hepatic and portal veins
How much 10 - 15 H
must a renal mass enhance in Hounsfield units before it is considered enhanced?
Metastatic > 2 cm node size in RCC?
lymph nearly alwasy metastatic 1 - 2 cm indeterminate
Most common sites for RCC metastases?
lungs mediastinum bone liver contralateral kidney adrenal gland brain
Bosniak cystic renal mass categories?
Category I Benign simple cyst Category 2 Benign Complicated Category 3 Indeterminate cystic lesions Category 4 Malignant cystic tumors (enhancing soft tissue)
VHL and TS CNS involvement differences? retinal hemangioblastomas. TS--retinal and cerebral hamartomas
VHL--cerebellar, spinal cord, and
Emphysematous pyelonephritis versus emphysematous pyelitis?
Emphysematous pyelonephritis: diabetes, urinary obstruction, gas in renal parynchema, nephrectomy. Emphysematous pyelitis: gas in pelvis and calyces (trauma, iatragenic, infection), not a surgical urgency.
Renal stone not seen at CT?
Crystallin stones related to indinavir (protease inhbitor HIV Rx)
What size renalmm nearly always pass. own? rarely pass.
< 4 stones can pass on their > 8 mm
Tissue rim Halo of soft tissue that surrounds ureter stone.
Absence ofSubtle pyramids?
white sign of urinary obstruction on affected side.
Phlebolith distinguishers? central lucency, round
tail sign (vein),
Adrenocortical carcinomaNecrosis and calcification Delayed contrast washout
large > 5 cm features?
Adrenal calcification(neuroblastoma, gnaglioneuroma) Adult (adrenal carcinoma, pheochromocytoma, glanglioneuroma, metastases) Wolman's disease (autosomal recessive, enlarged calcified adrenal glands, hepatosplenomegaly)
In adrenal hyperplasia, adrenal limb thickness exceeds?
Organ of Zuckerkandl?
Common location for extra-adrenal pheochromoctyoma. Near origin of IMA
Common metastases to adrenal glands?
Lung Breast Melanoma
Lipid-rich adrenal adenoma Hounsfield units?
< 10 H
Lipid-poor adrenal adenoma 10 Enhancement washout > 50% 15 minute post-contrast H < 35
Non-contrast H > features?
Serous ascitesto +15
-10 attenuation value in H?
Hemoperitoneum attenuation H
>35, averaging 45 value in H?
With absence of intrahepaticvia azygosof IVC, how does lower body venous blood reach the heart?
Drainage to SVC segment system?
Aneurysmal diameters of abdominal aorta and iliac arteries?
AAA > 3 cm Iliac aneurysm > 1.5 cm
Hyperattenuating crescent sign? attenuation (dissecting contrast) within wall or intraluminal thrombus of AAA, impending rupture
Crescent area of high
Beak sign in distinguishing falselumen from create an acute angle: beak sign
Intimal flap and true lumen wall false lumen in aortic dissection?
Dilatation of vein at site of DVT means acute or chronic?
Abdominal Abdominal LN >lymph node pathologic size 6 mm
and retrocrural 10 mm. Retrocrural LN > cutoff?...
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This document was uploaded on 01/14/2014.
- Winter '14