> Do you have an example in mind for this?

Liver lesions, often benign cysts. Other cysts too (kidney, ovarian). Will often require targeted contrast MRI, and needle biopsy - which has notable risks for bleeding, often minor, but 3-4% can require surgery or even transfusion.

Bile leakage or infection can also result, or injuries to the gallbladder, bowel, bile ducts.