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 that is not completely occluded, fluid can also accumulate and form spermatic cord syringomyelia. Hu Yaozong, Department of Pediatric Surgery, Anqing Municipal Hospital [Etiology and pathogenesis] It is formed by excessive accumulation of abdominal fluid into the sphincter through the unoccluded sphincter duct. [Diagnosis] (a) Symptoms A lump 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. (B) Physical signs The mass is cystic with clear borders and a 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 ultrasound: the diagnosis can be made clearly by ultrasound. (D) Differential diagnosis: 1. inguinal hernia: inguinal hernia constitutes an opaque mass with unclear upper pole boundary and a feeling of impact when coughing. 2. testicular tumor: generally testicular tumor becomes solid, heavier than syringomyelia and negative in transmission, but it is easily confused with cystic testicular teratoma and can be differentiated by ultrasound. 【Treatment】Sphincter effusion with low tension within 1 year old has the possibility of self-healing and should be followed up and observed. Others should do sphincter high ligation.