Hydrocele
A hydrocele (fluid-filled hernia) is a swelling in the scrotum caused by fluid accumulation around the testicle. A hydrocele can occur around one testicle or both. It does not cause pain and has no impact on the development or function of the testicles. A hydrocele may be communicating if there is a channel in the inguinal canal connecting the hydrocele to the abdominal cavity, or it may be non-communicating. In children, communicating hydroceles are more common, and their size may vary throughout the day depending on the child's activity.