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The more commonly described inflammation of the vas deferens, vasitis nodosa, is a benign condition that has been well-characterized (both macroscopically and microscopically) and is usually associated with a history of vasectomy.
(3) When a thermal ("red hot wire") cautery is used, (4) a solid plug of scar tissue results with a minimum of spermatic granuloma formation and of vasitis nodosa. Should sperm escape the vas, the fascial barrier will prevent their reaching the urethral side and perpetuating fertility.
Vasitis nodosa, in which a Medusa's head of channels reaches our from the testicular end of the vas, could explain this "technical failure" if one such channel reached the urethral end.