Egypt's second faith is Coptic Christianity. Copts are heirs of an ancient Christian rite. Coptic Christianity was the predominant religion in Egypt until the 10th century when a lot of Christians diverted to Islam. Christianity itself was brought in Egypt by St. Mark in the middle of the first century AD.
Other possible causes of swelling behind the knee include abscesses (infections); tumors of the skin, soft tissue, or bones; bleeding; deep venous thrombosis (blood clot in the deep veins of the legs); or deformity of the joint after a fracture of any of the bones of your knee joint.
When the knee produces too much synovial fluid, the excess fluid causes the bursa behind the knee to expand and bulge. Common causes of Baker's cyst include arthritis, infection, torn knee cartilage and other knee injuries. Symptoms of a Baker's cyst. Often there are no symptoms and the cyst can remain unnoticed. If symptoms do occur, they can include: