Hi @ellerbracke, I have very large Baker's cyst (both knees). Mine came out gradually. My legs were feeling weird for about 3 weeks (pain, stiffness and difficulty with balance). I was seeing my PCP, Pain Management and Rheumatology and they didn't know what was happening to my legs until my husband saw the swelling behind my knees. I was prescribed Prednisone for a few days, rest, ice and elevation. Now they are talking about possibly draining them and injecting steroids. I have an appointment tomorrow and hopefully the Dr. can help me because this is very painful.