Body CT Flash Cards

Some cysticnectrotic calcification most common liver

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Unformatted text preview: toma 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. sign? 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) Children causes? In adrenal hyperplasia, adrenal limb thickness exceeds? 10 mm 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? Acute 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.

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