Azoospermia (aspermia) is a complete lack of sperm in the semen ejaculated by a man.

It may be a side effect of testicular disease, chemotherapy or radiation, or deliberately induced by a vasectomy procedure.

Comparison of magnified semen analysis showing normal semen with sperm and semen sample with azoospermia and white blood cells

Semen sample with Azoospermia and showing white blood cells
Image by Bobjgalindo [2] (CC BY-SA 3.0)

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