malignant fibrous histiosarcoma

Is there anyone who has had/has this type of cancer? I was diagnosed 8years ago. Recently, I have had similar symptons, however in my other leg. The doctor keeps telling me that this type of cancer only comes back to same leg or lungs. I have done an MRI, and say they don't see anything. However, there is no explaination why my groin hurts again. I'm frustrated, because this is the same thing that happened 8years ago. Has anyone had this type of cancer, and have it return?