The presence of effusion in the left sphincter cavity may be a congenital disease or an acquired disease.1. If the left sphincter cavity effusion is found in children, it is mostly a congenital disease. Because the connection between the abdominal cavity and the scrotum is not closed during development, and the exudate from the abdominal cavity enters the scrotum, the scrotum becomes enlarged and forms syringomyelia. It is usually detected after birth, but can also be detected after six months of life, and presents as an enlarged unilateral scrotum. The treatment requires surgery to ligate the unclosed sphincter in order to cure it completely. 2. Adults mainly have acquired syringomyelia, which is caused by infection, trauma and other factors, resulting in increased secretion of fluid from the testicular sphincter and decreased absorption, and an imbalance in secretion and absorption. After giving anti-infection treatment, hemostasis and other symptomatic treatment, the sphincter effusion can be reduced or disappeared. If the effect of medication is unsatisfactory and the effusion is progressively enlarged and accompanied by symptoms of pain and infection, surgery can also be given after infection control.