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Vasitis nodosa is a complication experienced in approximately 66% of men who undergo vasectomy. It is a benign nodular thickening of the vas deferens, in which small offshoots proliferate, infiltrating surrounding tissue. It can be mistaken for low-grade adenocarcinoma by pathologists, and is implicated in late vasectomy failure.
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Vasitis nodosa Wikipedia(Text) CC BY-SA