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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）』 ■ウィキペディアで「monorchism」の詳細全文を読む スポンサード リンク
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