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Baker's Cyst, also called popliteal cyst, is a fluid-filled cyst behind the knee. A Baker's cyst is usually the result of knee-joint conditions, such as arthritis or torn cartilage, that cause the knee to produce too much lubricating fluid. Symptoms, when they occur, may include a bulge and tight feeling behind the knee. Treatment, if needed, involves treating the underlying condition. Other options include a cortisone injection, fluid drainage with a needle, or physical therapy.