Hepatocellular carcinoma CT: Difference between revisions
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==Overview== | ==Overview== | ||
In patients with a higher suspicion of HCC (such as rising [[alpha-fetoprotein]] and [[des-gamma carboxyprothrombin]] levels), the best method of diagnosis involves a [[computed axial tomography|CT scan]] of the abdomen using [[radiocontrast|intravenous contrast]] agent and three-phase scanning (before contrast administration, immediately after contrast administration, and again after a delay) to increase the ability of the [[radiologist]] to detect small or subtle tumors. It is important to optimize the parameters of the CT examination, because the underlying liver disease that most HCC patients have can make the findings more difficult to appreciate. | |||
==CT Scan== | ==CT Scan== | ||
Revision as of 14:45, 21 August 2012
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
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Hepatocellular carcinoma Microchapters |
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Differentiating Hepatocellular carcinoma from other Diseases |
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Diagnosis |
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Treatment |
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Case Studies |
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Hepatocellular carcinoma CT On the Web |
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American Roentgen Ray Society Images of Hepatocellular carcinoma CT |
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Risk calculators and risk factors for Hepatocellular carcinoma CT |
Overview
In patients with a higher suspicion of HCC (such as rising alpha-fetoprotein and des-gamma carboxyprothrombin levels), the best method of diagnosis involves a CT scan of the abdomen using intravenous contrast agent and three-phase scanning (before contrast administration, immediately after contrast administration, and again after a delay) to increase the ability of the radiologist to detect small or subtle tumors. It is important to optimize the parameters of the CT examination, because the underlying liver disease that most HCC patients have can make the findings more difficult to appreciate.
CT Scan
On CT, HCC can have three distinct patterns of growth:
- A single large tumor
- Multiple tumors
- Poorly defined tumor with an infiltrative growth pattern
Once imaged, diagnosis is confirmed by percutaneous biopsy and histopathologic analysis.
The key characteristics on CT are hypervascularity in the arterial phase scans, washout or de-enhancement in the portal and delayed phase studies, a pseudocapsule and a mosaic pattern. Both calcifications and intralesional fat may be appreciated.
CT scans use contrast agents, which are typically iodine or barium based. Some patients are allergic to one or both of these contrast agents, most often iodine. Usually the allergic reaction is manageable and not life threating.
An alternative to a CT imaging study would be the MRI.