Pediatric syringomyelia, commonly known as “watery eggs,” often appears as a cystic mass in the groin or scrotum with a “watery” feeling. Syringomyelia can develop on one side or both sides at the same time or sequentially, and the mass grows slowly and does not cause pain. However, parents are often very nervous about the discovery of a mass and seek medical attention. Ultrasound examination of syringomyelia will reveal a dark area of fluid within the mass. Pediatric syringomyelia is caused by excessive accumulation of abdominal fluid in the sphincter through the unclosed syringomyelia. If the unclosed syringomyelia is thicker in caliber, the mass may shrink after lying down. According to the location of the unclosed syringomyelia and fluid accumulation, there are two types of spermatic sphincter effusion and testicular sphincter effusion. In spermatic cord syringomyelia, the mass is located in the spermatic cord and is small and oval in shape. In testicular syringomyelia, the mass drapes over the base of the scrotum and is oval or round. If the mass is in high tension, the testicle cannot be felt; if it is not in high tension, the testicle can be palpated within the cystic mass. Syringomyelia can be seen in all age groups of children, mostly boys, with occasional syringomyelia in girls. It is called Muck’s cyst. Syringomyelia should be differentiated from other intra-scrotal or inguinal masses, such as testicular tumors, inguinal hernia, and inguinal lymphadenitis. Since occlusion of the sphincter can continue to occur after birth and the lymphatic system of the sphincter tends to mature, a small amount of fluid can be gradually absorbed on its own, so pediatric syringomyelia has the potential to heal on its own. The younger the child is, the less fluid there is and the higher the rate of self-healing. Children older than 1 year of age are less likely to heal on their own and often require surgical treatment. If the amount of fluid in a pediatric syringomyelia is large and the tension is very high, it may affect the blood circulation of the testes and impair the function of the testes, so it is advisable to perform a high level ligation of the syringomyelia as soon as possible according to the situation. If the child is young, has a short course of disease, the amount of fluid is small and the tension is low, the child can be observed and followed up until it subsides on its own. Observe until about 1 year of age, and treat if it does not heal. The prognosis of pediatric syringomyelia after surgery is good and the outcome is positive. In adults, syringomyelia is often caused by trauma or infection and has a different pathogenesis than pediatric syringomyelia, and the surgical approach is not the same.