Editor—I read with interest the study by Jaswon et al on outcome in antenatally diagnosed renal pelvis dilatation.1 The cohort was recruited antenatally from pregnancies where renal pelvis dilatation had been diagnosed mostly on the 20 week ultrasound scan. VUR was described as being “the most common clinically significant pathology” (23 out of 104 cases). Presumably all of the babies were asymptomatic. How can the …