Help Mr. Charles, he has sarcoma

Charles has been diagnosed with sarcoma. He is retired, and on Medicare and lives in southern Illinois.
He loves cats, and worked hard all his life. He will soon be 89 years old.
He is going to have a lot of medical bills. We take him tomorrow to see the orthopedic oncologist at Washington University School of Medicine in St. Louis. What started out as a small lump on his leg (his regular doctor thought it was a cyst),has grown massively in the past 2 months while waiting to get seen. We are afraid. These pics are graphic.