How can an radiologist tell the difference between a liver hemangioma and possible liver cancer?

answered:

MRI or CT

Cancer
Usually a radiologist can distinguish the two types of lesions via an MRI scan (and also a CT scan).
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MRI or CT scan

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This is usually a pretty straight-forward distinction based on a CT or MRI scan. The important point is that the scan has to be ordered as a "hemangioma protocol" with IV contrast. Hemangiomas usually take up and release IV contrast in a predictable fashion in comparison with liver cancer. Rarely, if there is still a question, the mass can be biopsied without a serious risk for bleeding.
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Varies

Liver_lobule
Usually the radiologist will use a combination of tests to tell. Sometimes an ultrasound with doppler, sometimes a CT scan, and sometimes an additional MRI scan may be indicated. There are specific findings on a radiology test that would help the radiologist tell the difference. Hemagiomas of the liver can be fairly common.
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