I wonder does anyone know what a liver Fluke is?? if you eat deer liver you probably ate one. Best to remove them before eating. The Choice is yours.

Liver fluke
Liver fluke is a collective name of a polyphyletic group of parasitic trematodes under the phylum Platyhelminthes. They are principally parasites of the liver of various mammals, including humans. Capable of moving along the blood circulation, they can occur also in bile ducts, gallbladder, and liver parenchyma.Wikipedia