The testicular sphincter cavity contains a small amount of plasma, which allows the testicle to have a certain range of sliding within the sphincter cavity. If too much fluid accumulates in the lumen, it becomes a sphingomyelomeningocele. If the residual part of the peritoneal sphincter in the spermatic cord area is not completely occluded, fluid can also accumulate and form spermatic cord syringomyelia. Etiology and pathogenesis】 It is formed by excessive accumulation of abdominal fluid into the sphincter through the unclosed sphincter duct. Diagnosis】 (a) Symptoms A mass appears in the groin or on one or both sides of the scrotum, which grows slowly and does not cause pain. If the caliber of the unclosed sphincter is thicker, the mass shrinks after lying down or sleeping. (ii) Physical signs The mass is cystic in nature with clear borders and positive transillumination test. In spermatic sphincter effusion, the mass is located in the spermatic cord, small in size and ovoid in shape, and the testis can be retrieved under the mass. (C) Laboratory examination B ultrasound: the diagnosis can be made clearly by ultrasound. (D) Differential diagnosis 1, inguinal hernia: inguinal hernia constitutes an opaque mass with indistinct upper pole boundaries and a sensation of impact when coughing, which is easily incorporated into the abdominal cavity gradually if there is no impaction. Testicular tumor: Generally, testicular tumor is solid, heavier than syringomyelia, with negative light transmission, but it is easily confused with cystic testicular teratoma, which can be identified by ultrasound. 【Treatment】 Those with low tension of syringomyelia within 1 year old have the possibility of self-healing and should be followed up and observed. Others should do sphincter high ligation.