What is absence of the vas deferens?

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What is absence of the vas deferens?

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Men who have an absence of the vas deferens are missing part of the tube that sperm travel along after they leave the testes. These tubes do not grow or they degenerate in early life and the men are infertile, as sperm cannot pass from the testis into the ejaculate. Men born with this problem, known as congenital absence of the vas deferens (CAVD), are usually missing both their vas deferens and two thirds of their epididymis.

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