itself does not usually show up on an x-ray unless it has been present for a long time and has caused other changes to happen in a joint.
X-rays are usually done to make sure that something else isn't causing the pain. Bursitis is usually what doctors call a clinical diagnosis based on how the patient describes the pain and doing an exam that shows pain directly over the hip bursa, swelling in the area, and pain and tenderness in the area with movement. Bursitis pain usually is located just above the bump on the outside of the hip called the greater trochanter. It usually hurts to touch the area and is worsened by movement.
Cancer pain on the other hand is usually worse at night and unless the bone is weak (which would have likely shown up on the x-ray) is not affected as much by movement.
If the pain gets worse or doesn't resolve with rest, stretching exercises, and/or a short course of anti-inflammatory medications you need to get things checked out again to make sure there isn't a more serious problem.
Tenderness directly over the bursa
pain with movement of overlying muscles and tendons
swelling of the bursa
bursitis pain in the hip.