Mutations in the CFTR gene may also lead to atypical and less severe forms of disease, such as isolated congenital bilateral absence of the vas deferens (CBAVD), chronic pancreatitis or bronchiectasis, regrouped under the term of « CFTR-related disorders » (CFTR-RD) [2]. The gene discussed is CFTR; the disease is congenital bilateral aplasia of vas deferens from CFTR mutation.