title: Ectopic vas deferens.
abstract: Two infants with ectopia of the vas deferens are described. To date 11 cases have been reported, comprising a total of 13 ectopic vas insertions, 2 of which are bilateral. A classification of 2 types of ectopic vas is presented with a discussion of their relationship to ureteral ectopias. An embryological hypothesis of a proximal vas precursor segment of the wolffian duct is related closely to Stephens' theory of ureteral development.
mesh_terms: D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008650:Mesonephros / Q000033:anatomy & histology; D014513:Ureter / Q000196:embryology; D014649:Vas Deferens / Q000002:abnormalities*