Congenital Bilateral Absence of Vas Deferens (CBAVD)

Definition - What does Congenital Bilateral Absence of Vas Deferens (CBAVD) mean?

Congenital absence of the vas deferens (CAVD) is a condition in which the tubes that carry the sperm out of the testicles, called the vas deferens, are absent by birth. The absence of vas deferens may be one-sided (unilateral) or two-sided (bilateral). Men with bilateral absence of vas deferens cannot transport sperm out of their testes and are therefore unable to concieve natrually.

FertilitySmarts explains Congenital Bilateral Absence of Vas Deferens (CBAVD)

Vas deferens is a part of the male reproductive tract that functions to transport sperm out of the testicles. Its function is similar to the Fallopian tubes, which function to transport the eggs out of the ovaries. Absence or aplasia of the vas deferens is a condition in which these tubes are absent by birth.

The absence of vas deferens can be unliteral (one-sided) or bilateral (two-sided). The unilateral absence of vas deference is a less common variety of this condition. It is associated with unilaterally absent kidney, also known as unilateral renal agenesis. The bilateral absence of vas deference is a more prevalent variety of this disorder in which both tubes are absent. This condition is associated with a genetic disorder called cystic fibrosis (CF).

Men with unilateral absence of vas deferens can conceive naturally as long as the testicles and vas deferens of the other side are functional. However, sufferers of bilateral absence of vas deferens are unable to transfer sperm to their semen. As a result, their semen contains no sperm, something known as azoospermia. Men with bilateral absence of vas deferens can reproduce through assisted methods like testicular sperm extraction and intracytoplasmic sperm insemination (ICSI).

The diagnosis is made after tests like scrotal ultrasound or transrectal ultrasound (TRUS). Semen analysis is also important to determine the sperm count.

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