congenital absence of the vas deferens (CAVD) congenital absence of the vas deferens (CAVD) congenital absence of the vas deferens (CAVD) congenital absence of the vas deferens (CAVD) congenital absence of the vas deferens (CAVD) congenital absence of the vas deferens (CAVD) congenital absence of the vas deferens (CAVD) congenital absence of the vas deferens (CAVD) congenital absence of the vas deferens (CAVD)