My daughter made an ultrasound: Hypertrophy Column of Bertin!

My daughter did a full-blown abdomen ultrasound and diagnosed Bertin's column hypertrophy or pyelo-calicial duplication on the right, what's this? And what is the course to be taken? do I take to the gastroenterologist who asked or for a urologist? (she as a child had recurrent urinary tract infections) but this time due to stomach pains. Thank you very much in advance.