Monorchism (also monorchidism) is the state of having only one testicle within the scrotum.

SpecialtyMedical genetics 


This can be due to:

  • One testicle not descending into the scrotum during normal embryonic or fetal development (3–4% of 'normal' live births), also known as undescended testis or cryptorchidism. In this case the testis is within the abdominal cavity, somewhere along the normal route of descent – most commonly, within the inguinal canal. Such a testis has an increased risk of malignancy.
  • One testicle may disappear during development (the so-called vanishing testis) due to some intrauterine insult. This is thought to be most likely vascular, such as testicular torsion.
  • One testicle may have been surgically removed through orchiectomy.
  • One testicle may be injured.

Notable cases

Due to testicular cancer

Due to injury

Due to cryptorchidism

Monorchism in nonhuman animals

Although extremely rare, monorchism has been observed to be characteristic of some animal species, notably in beetles.[18]


An individual having monorchism can be referred to as monorchid.

See also


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  2. "1984-01-23 HOSPITALIZED. Frank Church, 59". TIME. 1984-01-23. Retrieved 2010-05-13.
  3. Urological Sciences Research Foundation page on Tom Green
  4. ABC: Testicular Cancer and Mark Latham
  5. Baggaley, Michael (July 22, 2009). "Port Vale: Horsfield hoping his luck can rub off on Valiants". The Sentinel. Retrieved 2009-07-22.
  6. "Nuggets: Nene's testicular tumor malignant, cancer isolated". USA Today. January 22, 2008. Retrieved 2012-02-19.
  7. "After surgery for cancer, wide receiver Kevin Curtis gets a chance with Miami Dolphins". Palm Beach Post. December 17, 2010. Retrieved 2012-02-19.
  8. Farage, Nigel (13 March 2015). "Nigel Farage: Cancer, a lemon-sized testicle and how the NHS failed me". The Daily Telegraph. Retrieved 10 April 2015.
  9. "David Beckham is great, but Bobby Moore was one of a kind". Mirror. February 14, 2009. Retrieved 2012-02-21.
  10. Chronicle of John Hardyng, ed. Ellis, H., p.381. London, 1812.
  11. "BBC News - Spain's Franco 'had one testicle'". Retrieved 7 December 2015.
  12. "Hard Man Bayliss". Visordown. Retrieved 7 December 2015.
  13. "MMA cost Brian Foster a nut". Rebellion Media. April 13, 2011. Retrieved 2012-02-19.
  14. "Warrington Wolves: Paul Wood has testicle removed". BBC. 7 October 2012. Retrieved 25 July 2017.
  15. Merry, Stephanie (2017-10-05). "The new Thurgood Marshall biopic is trying not to be a 'good for you' movie". Washington Post. ISSN 0190-8286. Retrieved 2018-06-21.
  16. Li Zhisui (2010). Private Life Of Chairman Mao: The Memoirs of Mao's Personal Physician. Random House. p. 100. ISBN 9781407059228.
  18. Will KW, Liebherr JK, Maddison DR, Galián J (2005). "Absence asymmetry: the evolution of monorchid beetles (Insecta: Coleoptera: Carabidae)". J. Morphol. 264 (1): 75–93. doi:10.1002/jmor.10319. PMID 15732050. Archived from the original on 2013-01-05.
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