What is the reason for azoospermia suddenly having sperm?

Patient's question:

My husband's older brother and sister-in-law have been married for several years. The sister-in-law never got pregnant. Later, they had a comprehensive and thorough medical examination at the hospital and found that my husband's older brother has azoospermia. They took many medications, but it had no effect. Later, the sister-in-law got pregnant, and suddenly there was sperm with azoospermia. Is this possible?

Doctor's answer:

If it is congenital azoospermia, this condition is characterized by abnormal congenital growth and development or external factors that impair the testicles' ability to produce sperm, making it a clinically diagnosed infertility issue that is difficult to self-recover from. Clinical diagnosis primarily involves the use of in vitro fertilization to achieve pregnancy. It is important to adjust one's mindset appropriately, correctly understand the natural childbirth process, and avoid mental tension. If natural childbirth is not possible, other methods can be explored.

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