Oslam Syndrome, also known as Osteosarcoma
Hi, I am just a cell, but I have been secreting a growth factor structurally related to a homodimer of PDGF A-chains which is OSLAM Syndrome or Osteosarcoma. Unfortunately, I have developed in the osteoblast cells that form bones. I commonly affect bones around the knees, but I can affect any bone within the body. my host will most likely need to be amputated. they might not be able to walk or carry objects that need two hands again.

I used questions like ‘what is olsam syndrome’ and after finding out its another name for osteosarcoma I asked ‘what causes osteosarcoma’ and ‘how does osteosarcoma affect the body.’
I used the Google scholar search becasue I new it would be factual and have professionally done websites. I got the picture from the Wikipedia page for Osteosarcoma.

sources
http://europepmc.org/abstract/med/3456080
http://www.hopkinsmedicine.org/healthlibrary/conditions/bone_disorders/osteosarcoma_85,P00127/