Castration is also known as gonadectomy or orchiectomy is surgical procedure to remove one or two male testicles.
The testicles, which are male reproductive organs that produce sperm, sit in a sac, called the scrotum. The scrotum is just below the penis.
There are two common orchiectomy procedures for transgender women: bilateral orchiectomy and simple orchiectomy. In a bilateral orchiectomy, the surgeon removes both testicles. During a simple orchiectomy, the surgeon could remove either one or both testicles.
Bilateral orchiectomy is the more common type of orchiectomy for transgender women.