Vasitis nodosa

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| name = Vasitis nodosa

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| image = Vasitis_nodosa_-11-_intermed_mag.jpg

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| caption = Micrograph of vasitis nodosa (left of image). H&E stain.

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| field = Urology

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Vasitis nodosa is a complication experienced in approximately 66% of men who undergo vasectomy.{{cite journal |vauthors=Taxy JB, Marshall FF, Erlichman RJ |title=Vasectomy: subclinical pathologic changes |journal=Am. J. Surg. Pathol. |volume=5 |issue=8 |pages=767–72 |date=December 1981 |pmid=7337163 |doi= 10.1097/00000478-198112000-00005|s2cid=19752414 }} It is a benign nodular thickening of the vas deferens, in which small offshoots proliferate, infiltrating surrounding tissue.{{cite journal |vauthors=Hirschowitz L, Rode J, Guillebaud J, Bounds W, Moss E |title=Vasitis nodosa and associated clinical findings |journal=J. Clin. Pathol. |volume=41 |issue=4 |pages=419–23 |date=April 1988 |pmid=3366928 |pmc=1141468 |doi= 10.1136/jcp.41.4.419}} It can be mistaken for low-grade adenocarcinoma by pathologists,{{cite journal |vauthors=Deshpande RB, Deshpande J, Mali BN, Kinare SG |title=Vasitis nodosa (a report of 7 cases) |journal=J Postgrad Med |volume=31 |issue=2 |pages=105–8 |date=April 1985 |pmid=4057111 |url= http://www.jpgmonline.com/article.asp?issn=0022-3859;year=1985;volume=31;issue=2;spage=105;epage=8;aulast=Deshpande }} and is implicated in late vasectomy failure.