It is essential to know that if the tumor
in the arm is benign or malignant. If possible you need to have second opinion
on the biopsy
report because the reports of two doctors are controversial.Request the doctor who performed the biopsy to provide you the slide for review.
Secondly you need to see a competent orthopedic surgeon to take his opinion and see if the debunking or exicion of the tumor is possible. Even if proved malignant , after debulking or excision of the tumor radiotherapy will be more successful.