Benign bladder neck polyp causing tandem obstruction of the urinary tract in a patient with Beckwith-Wiedemann syndrome

The Beckwith-Wiedemann syndrome emphasizes the frequent association of the development of malignancy, particularly Wilms tumor or adrenocortical carcinoma. We report on a neonate with the Beckwith-Wiedemann syndrome whose main urologic abnormality was a benign polyp of the bladder neck. The polyp caused obstructions in tandem at the bladder neck at both ureterovesical junctions and the left ureteropelvic junction.