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Leg Swelling (Edema), New Onset
Another cause of sudden calf swelling that is not serious is a ruptured Baker's cyst. A Baker's cyst is a collection of fluid behind the knee that can develop after a knee swells. It usually occurs in people with arthritis. The cyst can tear with the fluid leaking down into the calf.
The fluid that leaks into the calf will eventually get reabsorbed. Treating the arthritis can help decrease the size of the Baker's cyst.
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