What is the most common presenting symptom of a Baker's cyst?

The most common presenting symptom of a Baker's cyst is calf and ankle edema. A Baker's cyst, which is a fluid-filled sac that forms behind the knee, often results from conditions that cause increased fluid production in the knee joint, such as arthritis or knee injuries. As the cyst enlarges, it can lead to swelling in the calf and ankle area due to the accumulation of synovial fluid.

This edema is typically due to the blockage and pressure that the cyst places on surrounding tissues and veins, which impairs normal drainage and can cause fluid to build up in the lower leg. Patients may notice that the back of their knee feels tight or that there is prominent swelling in the calf and ankle.

Other symptoms can occur, but calf and ankle swelling is the primary and most noticeable symptom for many individuals with a Baker's cyst. Understanding this helps in diagnosing and managing the condition effectively.