All of a sudden I have developed a very bad pain from my butt all the way down my left leg. I got a shot of cortisol ion tt my butt, and it seemed to go away. Then about a month later the pain returned. Went to the doctor and he did give me another shot, but this did nothing for the pain, so He ordered an MRI. MRI showed a mass impinging on my L4 vertebrae, which is probably pinching my sciatic nerve. I am going to see a neurosurgeon the 23rd. If this is cancer, it will be my fourth one, so I m praying it's just a benign tumor. I still have all my hair despite three former chemo therapies. I don't want to be bald!