# Appendix of testis

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> Source: https://en.wikipedia.org/wiki/Appendix_of_testis
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{{Short description|Part of the testis}}
{{One source|date=December 2025}}
{{Infobox anatomy
| Name        = Appendix of testis
| Latin       = appendix testis
| Image       = Gray1148.png
| Caption     = The right [testis](/source/testis), exposed by laying open the [tunica vaginalis](/source/tunica_vaginalis) (''appendix of testis'' is labeled at right)
| Image2      =
| Caption2    =
| System      =
| Artery      =Testicular artery
| Vein        =
| Nerve       =
| Lymph       =
| Precursor   = [Paramesonephric duct](/source/Paramesonephric_duct)
|vein=Testicular vein, pampiniform plexus}}
[[File:Ultrasonography of an appendix on a testicle in a hydrocele.jpg|thumb|[Scrotal ultrasonography](/source/Scrotal_ultrasonography) of an 85-year-old man with [hydrocele](/source/hydrocele), making the appendix of the testicle clearly distinctive as a 4 mm outpouching at upper right in image. [Doppler](/source/Doppler_ultrasound) shows some blood flow.]]
The '''appendix testis''' (or '''[hydatid of Morgagni](/source/hydatid_of_Morgagni)''') is a [vestigial](/source/vestigial) remnant of the [Müllerian duct](/source/M%C3%BCllerian_duct), present on the upper pole of the [testis](/source/testis) and attached to the [tunica vaginalis](/source/tunica_vaginalis). It is present about 90% of the time.{{Citation needed|date=May 2021}}

==Clinical significance==
===Torsion===
The appendix of testis can occasionally become twisted, causing acute one-sided testicular pain and may require surgical excision to achieve relief. One third of patients present with a palpable "blue dot" discoloration on the scrotum.  This is nearly diagnostic of this condition. If clinical suspicion is high for the serious [differential diagnosis](/source/differential_diagnosis) of testicular torsion, a surgical exploration of the scrotum is warranted. Torsion of the appendix of testis occurs at ages 0–15 years, with a mean at 10 years, which is similar to that of testicular torsion.<ref>{{cite journal|url=https://emedicine.medscape.com/article/778170-overview#a6|title=Torsion of the Appendices and Epididymis|author=Jason S Chang|website=[Medscape](/source/Medscape)|date=7 June 2022 }} Updated: Oct 20, 2016. Citing:<br>{{cite journal|last1=Nason|first1=Gregory J|last2=Tareen|first2=Farhan|last3=McLoughlin|first3=Danielle|last4=McDowell|first4=Dermot|last5=Cianci|first5=Fiona|last6=Mortell|first6=Alan|title=Scrotal exploration for acute scrotal pain: A 10-year experience in two tertiary referral paediatric units|journal=Scandinavian Journal of Urology|volume=47|issue=5|year=2013|pages=418–422|issn=2168-1805|doi=10.3109/00365599.2012.752403|pmid=23281617 |s2cid=3072304 |doi-access=free}}</ref>

==See also==
* [Paraovarian cyst](/source/Paraovarian_cyst)

==References==
{{Reflist}}

==External links==
* {{eMedicine|emerg|595}}
* {{WhoNamedIt|synd|292}}

{{Male reproductive system}}
{{Authority control}}

Category:Mammal male reproductive system

{{genitourinary-stub}}

[de:Morgagni-Hydatide](/source/de%3AMorgagni-Hydatide)

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Adapted from the Wikipedia article [Appendix of testis](https://en.wikipedia.org/wiki/Appendix_of_testis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Appendix_of_testis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.