Stages of fibrosis

My Gastro has this plastic, pull apart model of the liver in various stages of fibrosis in one of the exam rooms. It is in sections and could be a child's toy if it were not so gross looking. Stage F0 = no fibrosis is not one of the sections. I guess it would look smooth and shiny

The model is these four sections. If I have to wait too long I put on a pair of exam gloves and pull the sections apart. Once I tried to fit them together in a different order and they got stuck. I could not fix it. Finally I was able to pull the two pieces apart when I put the model between my feet and pulled. I fell backward into this thing of brochures and they went everywhere. There were brochures in Spanish and brochures in English. There was a ton of stuff on Hepatitis B. It took me a good ten minutes to put everything back.

Stage F1 = mild fibrosis. • looks kind of textured but the chunk of plastic pretty much feels smooth
Stage F2 = moderate fibrosis. • feels textured and is darker
Stage F3 = bridging fibrosis • looks like a rotting brownie with raisins
Stage F4 = cirrhosis • looks like a rotting brownie with raisins and walnuts