Hepatocellular adenoma CT: Difference between revisions
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{{Hepatocellular adenoma}} | {{Hepatocellular adenoma}} | ||
{{CMG}}; {{AOEIC}} {{CZ}} | {{CMG}}; {{AOEIC}} {{CZ}} | ||
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==Overview== | ==Overview== | ||
== | ==CT== | ||
* Fat or hemorrhage can easily be identified on unenhanced images, and delayed-phase images demonstrate the tendency for fibrotic components to enhance and retain contrast material. | * [[Fat]] or [[hemorrhage]] can easily be identified on unenhanced images, and delayed-phase images demonstrate the tendency for fibrotic components to enhance and retain contrast material. | ||
* Because | * Because [[adenoma]]s consist almost entirely of uniform [[hepatocyte]]s and a variable number of [[Kupffer cell]]s, most [[adenoma]]s are nearly isoattenuating relative to normal liver on unenhanced, portal venous–phase, and delayed-phase images. | ||
* In patients with fatty liver, adenomas are hyperattenuating at all phases of contrast enhancement and on unenhanced images as well. | * In patients with [[fatty liver]], adenomas are hyperattenuating at all phases of contrast enhancement and on unenhanced images as well. | ||
* Small hepatocellular adenomas enhance rapidly and are hyperattenuating relative to the liver. | * Small hepatocellular adenomas enhance rapidly and are hyperattenuating relative to the liver. | ||
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** The enhancement usually does not persist in adenomas because of arteriovenous shunting. | ** The enhancement usually does not persist in adenomas because of arteriovenous shunting. | ||
* Larger hepatocellular adenomas may be more heterogeneous than smaller lesions, and their CT appearance is less specific. | * Larger hepatocellular adenomas may be more heterogeneous than smaller lesions, and their [[CT]] appearance is less specific. | ||
==References== | ==References== | ||
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[[Category:Disease]] | [[Category:Disease]] | ||
[[Category:Types of cancer]] | [[Category:Types of cancer]] | ||
[[Category:Oncology]] | [[Category:Oncology]] | ||
[[Category:Gastroenterology]] | [[Category:Gastroenterology]] | ||
Revision as of 15:53, 18 September 2012
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Hepatocellular adenoma Microchapters |
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Diagnosis |
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Treatment |
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Case Studies |
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Hepatocellular adenoma CT On the Web |
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American Roentgen Ray Society Images of Hepatocellular adenoma CT |
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Risk calculators and risk factors for Hepatocellular adenoma CT |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]
Overview
CT
- Fat or hemorrhage can easily be identified on unenhanced images, and delayed-phase images demonstrate the tendency for fibrotic components to enhance and retain contrast material.
- Because adenomas consist almost entirely of uniform hepatocytes and a variable number of Kupffer cells, most adenomas are nearly isoattenuating relative to normal liver on unenhanced, portal venous–phase, and delayed-phase images.
- In patients with fatty liver, adenomas are hyperattenuating at all phases of contrast enhancement and on unenhanced images as well.
- Small hepatocellular adenomas enhance rapidly and are hyperattenuating relative to the liver.
- Excluding lesions with acute or old tumor hemorrhage and fat deposition, hepatocellular adenoma demonstrated homogeneous or nearly homogeneous enhancement in approx 80% of cases.
- The enhancement usually does not persist in adenomas because of arteriovenous shunting.
- Larger hepatocellular adenomas may be more heterogeneous than smaller lesions, and their CT appearance is less specific.