CFTR and congenital bilateral aplasia of vas deferens from CFTR mutation: Renal abnormality (RA) is sometimes detected during CAVD assessment.7,13,14 Moreover, although several studies have reported CFTR variants in CAVD patients with or without RA,7,15 others have found no CFTR variants among individuals with accompanying RA.13,16 Therefore, the general incidence of RA among CAVD patients and the relationship between CAVD-associated RA and CFTR variants remain unknown.