Hydrocele is a collection of fluid around one or both testicles, causing swelling of the scrotum or groin area. It commonly occurs in men over 40. There are two types of hydrocele: noncommunicating, where the fluid sac closes but the body does not absorb the fluid; and communicating, where the sac surrounding the testicle does not close completely, allowing fluid to flow in and out. Symptoms include swelling of the scrotum, pain, redness, and a feeling of pressure at the base of the penis. Diagnosis involves physical examination, transillumination to identify structures beneath the skin, and ultrasound to check for fluid in the scrotum. Treatment options include surgery, needle aspiration