5cm solid liver mass seen on us but not on ct. can a mass this size be missed? should i ask for a bx?

Liver mass...: Did they use IV contrast on ct or was it a noncontrast ct? There are several different imaging modalities which can help characterize liver mass before biopsy. Mri, nuclear tc sulfur colloid scan, and pet/ct scan are a few. Each modality can provide unique information about the mass. Discuss all options with your doctor to decide on the next step.