The authors present their experience (24 children) with the endoscopic subureteral injection of Teflon paste in the correction of secondary vesicoureteral reflux: reimplantation failure; ureterocele; obstructive bladder; exstrophy; postchemocystitis, and Hutch's diverticulum. Of these 24 cases (31 refluxing ureters), 18 were treated with success. Each cause justifies a comment on the particularities of its endoscopic treatment. The 'sting' can be particularly attractive to cure secondary reflux, avoiding the difficulties and complications of open surgical reimplantation.