Any vesicoureteral reflux in which the cause of the disease is a mutation in the TNXB gene. The disease is Monarch Disease Ontology id MONDO_0014422 (vesicoureteral reflux 8). Also known as: TNXB vesicoureteral reflux (disease), vesicoureteral reflux (disease) caused by mutation in TNXB, vesicoureteral reflux type 8.