A few months ago I started having severe headaches. An MRI revealed I had a brain lesion. They are unsure just what it is . It presents as a thin shadow on the film. I just had a functional MRI to illuminate the motor track in case by neuro surgeron decides on a biopsy. I don't have the med term. in front of me but they said it might be a low grade cancer, or it was caused by trauma or migraines. Any ideas?