Voiding cystourethrography (VCUG) has been usually considered as a painful and badly tolerated procedure in children. This opinion is not agreed with local experience of the authors. Objective: To evaluate the parent's perception about VCUG in children before and after the procedure. Methods: In 2009, parents of children who carne to Radiology Department for a VCUG completed an anonymous survey, including age and sex of their children, physician referent specialty, information received about the exam, expectation before and opinion after the procedure. Results: During 12 months 86 surveys were evaluated; patient's age was ranged between 1 month to 8 years with 52.3%> (45) girls and 47.7%> (41) males. Patients were referred from general pediatric in 59%o or nephrology practice in 33%>; 20%> of the patients did not receive any information about the procedure before. About the expectation of VCUG, previous the exam, parents considered the examination as a pediatrician visit in 2.3%, uncomfortable in 26.7%>, a little painful in 16.3%, painful in 21% and aggressive or terrible in 33.7%o. After the examination, parents' opinion was: 24.4%> as a pediatrician visit, 45.3%> uncomfortable, 22.1%o a little painful, 4.7%> painful and 3.5%> aggressive or terrible. The global parents' perception about VCUG after the exam improved in 66%> cases, did not change in 29%> and went worse in 5%. Conclusion: Parent's perception about VCUG in children significantly improves after the procedure; in 91.8%> the examination was considered uncomfortable or only a little painful.Con frecuencia se califica a la uretrocistografía miccional (UCG) como un examen doloroso y mal tolerado por los niños, lo que resulta discordante con la experiencia de los autores. Objetivo: Evaluar la percepción de los padres de las UCG efectuadas a sus hijos, antes y después del examen. Durante el año 2009, en el Servicio de Radiología de Clínica Las Condes, se solicitó a los padres contestar anónimamente una encuesta que incluía: edad y sexo del niño, especialidad médico solicitante, información recibida respecto del examen, explicitar expectativas antes del examen y opinión posterior. Se evaluaron 86 encuestas; edades: 1 mes a 8 años; 52,3% (45) niñas y 47,7% (41) varones; pediatra deriva 59% y nefrólogo 33%; 20% no recibió información del solicitante. Antes del examen: 2,3% como una visita al pediatra, 26,7% molesto, 16,3% un poco doloroso, 21% doloroso y 33,7% agresivo/terrible. Después de la UCG: 24,4% como una visita al pediatra, 45,3% molesto, 22,1% un poco doloroso, 4,7% doloroso y 3,5% agresivo/terrible. Post-examen: 66% mejora la percepción, 29% mantiene y 5% empeora. Conclusiones: La percepción de los padres mejora significativamente después de efectuado el examen; el 91,8% considera el examen como molesto o un poco doloroso.