A quick history. I'm a soon to be 60 year old woman who has had lower back pain on and off for a good long time. Mostly, I think it was normal wear and tear of aging. I was traveling for work extensively for about 5 years (this stopped 2 years ago) and my lower back, left side would ache sitting on a plane for a couple of hours. Same in a car. I always assumed it was from sitting, I still do , I think. Anyway, for the last 6 years I've been an endurance runner (Prior to that I had to stop running during times of knee/ankle surgeries. All has been good.) The last 1 1/2 years I've been doing Crossfit (my coach never pushes us to lift more than we are capable of and always makes certain we are lifting correctly). That lower back would hurt from time to time and I would go to the chiropractor and all would be fixed. However, beginning late fall 2014 my lower back started hurting more than usual. I made quite a few visits to the chiro and it wasn't helping. Even he suggested an MRI...I didn't go for the MRI. The last couple of months my back started hurting more than usual, down my glutes. A few weeks ago I couldn't get into my car because of the sharp pain. Sitting was and still hurts. That sharp pain stopped but I finally went for the MRI. The results are facet arthopathy at L4-L5 bilaterally with mild antoro-listhesis. Well circumascribed round cystic lesion with the left lateral dorsal epidural space at L4-L5 with mass effect on the descending L5 nerve root. Differential considerations include a synovial cyst emanating from the facet joint or a nerve root sleeve cyst. Selective nerve block wiill be helpfu to assess for site of pain. So I have some arthritis but what the heck is this cyst thing because I'm not finding much info in google land and what I have found it not making me happy. I've had cortisone injections in my knee, feet and ankle; sometimes it works for a while, sometimes it only helps for a couple of days. I don't want to give up this very active lifestyle.