obsolete_congenital bilateral absence of the vas deferens true Congenital bilateral absence of the vas deferens (CAVD) is a condition in which the two vas deferens, male reproductive organs, fail to form properly prior to birth. James Malone true Wikipedia: http://en.wikipedia.org/wiki/Congenital_absence_of_the_vas_deferens duplicate class with Congenital bilateral absence of vas deferens 2.32.2 http://www.orpha.net/ORDO/Orphanet_48