Children with a large scrotum a small possible causes: 1, testicular syringomyelia or traffic syringomyelia, is a congenital disease, after birth the inguinal region of the syringomyelia is not closed, so the abdominal cavity of the fluid flow to the scrotum, resulting in scrotal enlargement, usually no obvious pain symptoms. If there is no change in the size of the scrotum and no obvious change in volume when standing up or moving around, then it is testicular syringomyelia. If the scrotum is enlarged during activity or standing, but the enlarged scrotum shrinks when lying down, the presence of traffic syringomyelia is considered, and both require surgical treatment.2. Inguinal hernia is also a congenital disease, due to the failure of the sheath protrusion to close, and the abdominal cavity of the omentum, intestinal tubes and other tissues into the scrotum, resulting in scrotal enlargement. The appearance of the scrotum a large small, activity scrotum enlargement aggravated, lying down to rest after the scrotum enlargement reduced, ultrasound can be identified, the treatment needs to be surgical treatment.