Relation between the anatomical genital phenotype and cystic fibrosis transmembrane conductance regulator gene mutations in the absence of the vas deferens.

Objective: To study the correlation between genital phenotype and cystic fibrosis genotype in men lacking at least one vas deferens.

Design: Prospective study.

Setting: Institut Rhônalpin pour la Reproduction Humaine, Lyon-Bron, France.