The above picture shows the vas deferens isolated and one can see the clips and a small area of swelling of the vasectomy site. If there is swelling here, a sperm granuloma, then the potential for success is higher. A sperm granuloma is a “pop-off” valve of sorts and protects the sperm producing process of the testicle.
The presence of a sperm granuloma explains why a patient 10 years out from a vasectomy might have a better chance than a patient 5 years out who doesn’t have one. This is a random occurrence and can’t be predicted who or who will not have a sperm granuloma. They are only beneficial for the vasectomy patient who is to have a reversal.