Urethrocystography is a well established diagnostic procedure in the adult,1but its merits in infants and children are insufficiently recognized. The paucity of the literature on the subject is sufficient proof of this. In over three hundred papers and monographs and in highly specialized roentgenographic and urologic texts2references to urethrocystographic studies in children are meager or inadequately presented. Urethrocystoscopy in children is considered a formidable procedure. The necessity of hospitalization and anesthesia often results in procrastination by parents, and technical difficulties cause temporization by the physician. There is therefore need for a simple, painless and safe substitute for the endoscopic examination. We believe that urethrocystography is valuable for investigation of organic uropathy in pediatric patients. The simplicity of urethrography in children is advantageous. It is an office or dispensary procedure; anesthesia is not necessary; the ordinary x-ray apparatus, one or two simple instruments and a proper opaque