I have had chronic knee pain, so went to doctor and had x-ray. He saw nothing on the film, but called back 2 days later and said that the radiologist saw something. I then received a letter that said There is subtle decreased density within the medial femoral condyle. This is nonspecific with underlying marrow lesion not excluded. Recommend further evaluation with non-contrast MRI. A small joint effusion is suspected. There is mild patellofemoral osteoarthritis. Normal soft tissues. My MD said that he felt 90% that it was nothing , but still recommended I go forward with an MRI. I have a high deductible and all of the expense will be out of pocket. I have done some reading on line and understand that marrow lesion is a bone bruise . Here s my question: Are marrow lesions normally associated with malignancy?