I have a Baker s cyst behind my left knee. An MRI was done and the radiologist says there is a bone cyst behind the Baker s cyst. I also had a small meniscus tear on the opposite side of my knee which does not hurt and has never hurt. The area where the Baker s cyst is has severe thobbing, pulsating pain constantly. My orthopedic surgeon says there is nothing he can do about the cyst. I have a history of recently diagnosed Hurthle cell thyroid cancer post surgery and I-131 therapy. What can I do about this as the pain is excruciating and limits my activities of daily living. I saw the image on the MRI and it showed a dark spot on the bone. The radiologist did not mention this cyst in the original report. Could he have made a mistake and this be metastatic disease?