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Monorchism : ウィキペディア英語版
Monorchism

Monorchism (also Monorchidism) is the state of having only one testicle within the scrotum.
==Causes==
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 being surgically removed through orchidectomy.
* One testicle may be injured.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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