Intra-hepatic causes include cirrhosis, schistosomiasis, which is when flatworms invade the liver; and sarcoidosis, which is when inflammatory cells form lumps called Granulomas inside the liver.
Some of the proposed reasons are flatworm and hookworm infection, H. Pylori infection, gastrointestinal bleeding and their vitamin intake being disrupted by the incorporation of modern high-starch foods to the diet.
So we see this in things like some sea sponges, we see this in some flatworms, and we see it in other animals closely related to coralslike sea anemones and jellyfish.