On top of everyone else’s replies, as an ultrasound tech, on ultrasound, CT, etc, typically the appearance of a cancerous liver tumor has a different appearance than metastatic tumors on the liver. It gives an idea to look elsewhere based on the appearance. There’s different appearances for metastatic tumors on the liver giving possible clues as to where it could be coming from to search there for tumors as well.
Again though like others said, biopsies are needed to confirm everything, even that it’s cancer.
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