I had a soft tissue tumor removed about a year ago from my clavicle. At the time, it was approx.2-3 cm. It did not show up on ultrasound, mri or x-ray, but could be felt. Dr. didn t think it was cancerous, testing came back k negative. It was thought to be a hystiocytoma, but was negative for beta-catnine. It has come back. Very painful, all along the collar bone,shoulder and my neck. Just recently the lymph nodes on that side have swollen. My WBC IS low3.2, my platelets are low 145, MPV is 7.4, PMN 46, Grans 1.46. I am very worried that he was wrong in thinking that it wasn t cancer. Can a hystiocytoma become cancerous? . .