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Hydrocele is a fluid-filled pocket (sac) in the scrotum surrounding the testicle. It isn't usually painful, but it may be uncomfortable because it makes the scrotum bigger.
In order to treat the hydrocele, a small cut is made in your scrotum. The fluid is drained from around the testicle through a cut in the tunica vaginalis or 'envelope' surrounding the testis. The tunica is stitched in such a way that fluid can't reform in this layer. The cut is closed with dissolvable stitches.