Cystography in infants and children: A critical appraisal of the many forms with special regard to voiding cystourethrography

European Radiology

Volumn 12, Issue 12, 2002, Pages 2910-2918

  Riccabona, Michael ^a  

^a UNIVERSITY HOSPITAL GRAZ   (Austria)

Author keywords

Children; Echo enhanced cystosonography; Urinary tract infection; VCU; VUR

Indexed keywords

RADIOISOTOPE;

ANALYTIC METHOD; BLADDER DYSFUNCTION; BLADDER FUNCTION; CHILD; CHILD CARE; CYSTOGRAPHY; DIAGNOSTIC VALUE; ECHOGRAPHY; HUMAN; HYDRONEPHROSIS; INFANT; MICTURITION CYSTOURETHROGRAPHY; PRIORITY JOURNAL; RELIABILITY; REVIEW; TREATMENT INDICATION; URETHRA; URINARY TRACT INFECTION; VESICOURETERAL REFLUX; BLADDER; CHILD WELFARE; CYSTOSCOPY; HEALTH SURVEY; IMAGE QUALITY; INFANT WELFARE; PATHOLOGY; PRESCHOOL CHILD; RADIOGRAPHY; UROGRAPHY;

CHILD; CHILD WELFARE; CHILD, PRESCHOOL; CYSTOSCOPY; HEALTH STATUS INDICATORS; HUMANS; INFANT; INFANT WELFARE; RADIOGRAPHIC IMAGE ENHANCEMENT; URETHRA; URINARY BLADDER; URINARY TRACT INFECTIONS; UROGRAPHY; VESICO-URETERAL REFLUX;

EID: 0036885810     PISSN: 09387994     EISSN: None     Source Type: Journal    
DOI: 10.1007/s00330-002-1430-2     Document Type: Review

References (134)

1. Arant BS (1991) Vesicoureteral reflux and renal injury. Am J Kidney Dis 17:491-511
2. Bailey RR, Lynn KL, Smith AH (1992) Long term follow-up of infants with gross vesico-ureteral reflux. J Urol 148:1709-1711
3. Gordon I (1995) Vesicoureteral reflux, urinary tract infection and renal damage in children. Lancet 346:489-490
4. Merrick M, Notghi A, Chalmers N et al. (1995) Long term follow-up to determine the prognostic value of imaging after urinary tract infection. I. Reflux Arch Dis Child 72:388-392
5. Rollerston GL, Maling TMJ, Hodson CJ (1974) Intrarenal reflux and the scarred kidney. Arch Dis Child 49:531-539
6. Smellie J, Prescod N, Shaw P, Risdon R, Bryant T (1998) Childhood reflux and urinary infection: a follow-up of 10-41 years in 226 adults. Pediatr Nephrol 12:727-736
7. Avni FE, Hall M, Damry N, Schurmans T (2001) Vesico-ureteric reflux. In: Fotter R (ed) Pediatric uroradiology. Springer, Berlin Heidelberg New York, pp 121-144
8. Goonasekera C, Dillon MJ (1999) Hypertension in reflux nephropathy. Br J Urol 83:1-12
9. Jakobsson SH, Hansson S, Jakobsson B (1999) Vesico-ureteric reflux: occurence and long term risks. Acta Paediatr 431:S22-S30
10. Riccabona M (2000) Management of recurrent urinary tract infection and vesicoureteral reflux in children. Curr Opin Urol 10:25-28
11. Wolfish NM, Delbrouck N, Shanon A et al. (1993) Prevalence of hypertension in children with primary vesico-ureteral reflux. J Pediatr 123:559-563
12. Assael BM, Guez S, Marra G et al. (1998) Congenital reflux nephropathy: follow-up of 108 cases diagnosed perinatally. Br J Urol 82:252-257
13. Najmalin A, Burge DM, Atwell JD (1990) Reflux nephropathy secondary to intrauterine vesico-ureteral reflux. J Pediatr Surg 25:387-390
14. Stock JA, Wilson D, Hanna MN (1998) Congenital reflux nephropathy and severe unilateral reflux. J Urol 160:1017-1018
15. Shanon A, Feldman W (1990) Methodologic limitations in the literature on vesico-ureteral reflux: a critical review. J Pediatr 117:171-178
16. Avni EF, VanGansbeke D, Neuenschwander S, Schulman C (1994) The urinary tract. In: Carty H, Brunelle F, Shaw D, Kendal B (eds) Imaging children. Churchill Livingstone, Edinburgh, pp 562-586
17. Koff S, Wagner T, Jayanthi V (1998) The relationship among dysfunctional elimination syndromes, primary vesicoureteral reflux and urinary tract infections in children. J Urol 160:1019-1022
18. Monsour M, Azmy AF, MacKenzie RJ (1987) Renal scarring secondary to vesicoureteral reflux: critical assessment and new grading. Br J Urol 60:320-324
19. Olbing H, Claësson I, Ebel K et al. (1992) Renal scars and parenchymal thinning in children with vesicoureteral reflux. J Urol 148:1653-1656
20. Nielsen JB (1989) Lower urinary tract function in vesicoureteral reflux. Scand J Urol Nephrol 125:15-21
21. Ring E, Petritsch P, Riccabona M et al. (1993) Primary vesicoureteral reflux in infants with dilated fetal urinary tract. Eur J Pediatr 152:523-525
22. Sillen U, Hellström A, Homdahl G, Sölsnes E (1999) The voiding pattern in infants dilating reflux. Br J Urol Int 83:83-87
23. Sillen U, Hjalmas K, Aili M et al. (1992) Pronounced detrusor hypercontractibility in infants with gross bilateral vesicoureteral reflux. J Urol 148:598-599
24. Heale WF (1997) Hereditary VUR: phenotypic variation and family screening. Pediatr Nephrol 11:504-507
25. Hohenfellner K, Huntley TE, Brezindka R et al. (1999) ACE I/D gene polymorphism predicts renal damage in congenital uropathies. Pediatr Nephrol 13:514-518
26. Little M, Wells C (1997) A clinical overview of WT1 gene mutations. Hum Mutat 9:209-225
27. Noe HN, Wyatt RJ, Peden JH et al. (1992) The transmission of vesicoureteral reflux from parent to child. J Urol 148:1869-1871
28. Sirota L, Hertz M, Leufer J Jonas P, Boichis H (1986) Familial vesicoureteral reflux: a study of 16 families. Urol Radiol 8:22-24
29. Avni FE, Hall M, Janssens F (2001) Urinary tract infection. In: Fotter R (ed) Pediatric uroradiology. Springer, Berlin Heidelberg New York, pp 145-160
30. Elder JS, Peters CA, Arant BS et al. (1997) Pediatric vesicoureteral reflux guidelines panel summary report on the management of primary vesicoureteral reflux in children. J Urol 157:1846-1851
31. Jakobsson B, Jacobson SG, Hjâlmas K (1999) Vesicoureteral reflux and other risk factors for renal damage: identification of high and low-risk children. Acta Paediatr 431:S31-S39
32. Koff S, Murtagh D (1983) The uninhibited bladder in children: effect of treatment on recurrence of urinary infection and on vesicoureteral reflux resolution. J Urol 130:1138-1142
33. Pope JC, Brock JW, Adams MC, Stephens FD, Ichikawa I (1999) How they begin and how they end: classic and new theories for the development and deterioration of congenital anomalies of the kidney and the urinary tract. J Am Soc Nephrol 10:2018-2028
34. Seruca H (1989) Vesicoureteral reflux and voiding dysfunction: a prospective study. J Urol 142:494-498
35. Sillen U (1999) Bladder dysfunction in children with vesico-ureteric reflux. Acta Paediatr 431:S40-S47
36. Snodgrass W (1998) The impact of treated dysfunctional voiding on the non-surgical management of vesicoureteral reflux. J Urol 160:1823-1825
37. Ben-Ami T, Gayer G, Hertz M et al. (1978) The natural history of reflux in the lower pole of duplicated collecting system: a controlled study. Pediatr Radiol 19:308-310
38. Burge D, Griffith M, Malone P et al. (1992) Fetal vesicoureteral reflux: outcome following conservative management. J Urol 148:1743-1745
39. Cain MP, Pope JC, Casale AJ et al. (1998) Natural history of refluxing distal ureteral stumps. J Urol 160:1026-1027
40. Garin EH, Campos A, Homsy Y (1998) Primary vesicoureteral reflux: review of current concepts. Pediatr Nephrol 12:249-256
41. Gordon AC, Thomas DFM, Arthur RJ et al. (1990) Prenatally diagnosed reflux: a follow-up study. Br J Urol 65:407-412
42. Greenfield SP, Manyan NG, Wan J (1997) Resolution rates of low degree vesicoureteral reflux stratified by patient age at presentation. J Urol 157:1410-1413
43. Wennerström M, Hansson S, Jodal U et al. (1998) Disappearance of vesico-ureteral reflux in children. Arch Pediatr Adolesc Med 152:879-883
44. Bollgren I (1999) Antibacterial prophylaxis in children with urinary tract infection. Acta Pediatr Scand 431:S48-S52
45. Goldraich NP, Goldraich IH (1992) Follow-up of conservatively treated children with high and low grade vesicoureteral reflux: a prospective study. J Urol 148:1688-1692
46. Jodal U, Lindberg U (1999) Guidelines for management of children with urinary tract infection and vesico-ureteric reflux. Recommendations from a Swedish state-of-the-art conference. Acta Pediatr 431:S87-S89
47. Läckgren G, Wählin N, Sternberg A (1999) Endoscopic treatment of children with vesico-ureteral reflux. Acta Pediatr 431:S62-S71
48. Shapiro E, Elder J (1998) The office management of recurrent urinary tract infection and vesico-ureteral reflux in children. Urol Clin 4:725-734
49. Sillen U (1999) Vesicoureteral reflux in infants. Pediatr Nephrol 13:355-361
50. Weiss R, Duckett J, Spitzer A (1992) On behalf of the international reflux study in children: results of a randomized clinical trial of medical versus surgical management of infants and children with grade III and IV primary vesicoureteral reflux. J Urol 148:1667-1673
51. Burbige KA, Lebowitz RL, Colodny H et al. (1984) The megacystis megaureter syndrome. J Urol 131:1133-1161
52. Smellie JM, Tamminen-Mobius T, Olbing H et al. (1992) International reflux study in children. Five-year study of medical or surgical treatment in children with severe reflux: radiological renal findings. Pediatr Nephrol 6:223-230
53. Willi U, Lebowitz RL (1979) The so-called megaureter-megacystis syndrome. Am J Roentgenol 133:409-416
54. Yu TJ, Chen W, Chen HY (1997) Early versus late surgical management of fetal reflux nephropathy. J Urol 157:1416-1419
55. Fotter R (1996) Neurogenic bladder in infants and children: a challenge for the radiologist. Abdom Imaging 21:534-540
56. Fotter R, Kopp W, Klein E, Höllwart M, Uray E (1986) Unstable bladder in children: functional evaluation by modified voiding cystourethrography. Radiology 161:811-813
57. Jequier S, Jequier JC (1989) Reliability of voiding cystourethrography to detect reflux. Am J Roentgenol 153:807-810
58. Gelfand MJ, Koch BL, Elgazzar AH et al. (1999) Cyclic cystography: diagnostic yield in selected pediatric patient populations. Radiology 213:118-120
59. Blickman J, Taylor G, Lebowitz R (1985) Voiding cystourethrography: the initial study in children with urinary tract infection. Radiology 156:659-662
60. Dacher JN (2001) Diagnostic procedures excluding MRI, nuclear medicine and video-urodynamics. In: Fotter R (ed) Pediatric uroradiology. Springer, Berlin Heidelberg New York, pp 1-14
61. Fernbach SK, Feinstein KA, Schmidt MB (2000) Pediatric voiding cystourethrography: a pictorial guide. Radiographics 20:155-168
62. Lebowitz RL (1992) The detection and characterization of vesicoureteral reflux in the child. J Urol 148:1640-1642
63. Hellström M, Jacobsson B (1999) Diagnosis of vesico-ureteric reflux. Acta Paediatr (Suppl) 431:3-12
64. Paltiel HJ, Rupich RC, Kiruluta HG (1992) Enhanced detection of vesicoureteral reflux in infants and children with use of cyclic voiding cystourethrography. Radiology 184:753-755
65. Wyly JB, Lebowitz RL (1984) Refluxing urethral ectopic ureters: recognition by the cyclic voiding cystourethrography. Am J Roentgenol 142:1263-1267
66. Lebowitz RL, Olbing H, Parkkulainen KV, Smellie JM, Tamminen-Moebius TE (1985) International system of radiographic grading of vesicoureteral reflux. Pediatr Radiol 15:105-109
67. Bates CP, Whiteside CG, Turner-Warwick RT (1970) Synchronous cine pressure flow cysto-urethrography, with special reference to stress and urge incontinence. Br J Urol 42:714-722
68. Fotter R (2001) Functional disorders of the lower urinary tract and neurogenic bladder in infants and children. In: Fotter R (ed) Pediatric uroradiology. Springer, Berlin Heidelberg New York, pp 185-210
69. Chapman SJ, Chandler C, Haycock GB et al. (1988) Radionuclide cystography in vesicoureteral reflux. Arch Dis Child 63:650-671
70. Gordon I (2001) Diagnostic procedures: nuclear medicine. In: Fotter R (ed) Pediatric uroradiology. Springer, Berlin Heidelberg New York, pp 27-40
71. Willi UV, Treves S (1983) Radionuclide voiding cystogram. Urol Radiol 5:161-174
72. Mandel GA, Ehggli DF, Gilday DL et al. (1997) Procedure guideline for radionuclide cystography in children. Society of Nuclear Medicine. J Nucl Med 38:1650-1654
73. Godley ML, Ransley PG, Parkhouse HF et al. (1990) Quantitation of vesicoureteral reflux by radionuclide cystography and urodynamics. Pediatr Nephrol Semin 4:485-490
74. Mozley D, Heyman S, Duckett J et al. (1994) Direct vesicoureteral scintigraphy: quantifying early outcome predictors in children with primary reflux. J Nucl Med 35:1602-1608
75. Blane C, Pietro M di, Zerin JM et al. (1993) Renal sonography is not a reliable screening examination for vesico-ureteral reflux. J Urol 150:752-755
76. Pietro MA di, Blane CE, Zerin JM (1997) Vesicoureteral reflux in older children: concordance of ultrasound and VCUG findings. Radiology 205:821-822
77. Avni FE, Ayadi K, Rypens F, Hall M, Schulman CC (1997) Can careful US examination of the urinary tract exclude vesicoureteral reflux in the neonate? Br J Radiol 70:977-982
78. Bergius AR, Niskanen K, Kekomâki M (1990) Detection of significant vesicoureteral reflux by ultrasound in infants and children. Z Kinderchir 45:144-145
79. Diard F, Nicolau A, Bernard S (1987) Intrarenal reflux: a new cause of medullary hyperechogenicity? Pediatr Radiol 17:154-155
80. Ginalski JM, Michaud A, Genton N (1985) Renal growth retardation in children: sign suggestive of vesicoureteral reflux? Am J Roentgenol 145:617-619
81. Hiraoka M, Kasuga K, Hori C et al. (1994) Ultrasound indicators of vesico-ureteral reflux in the newborn. Lancet 343:519-520
82. Hiraoka M, Hashimoto G, Hori C et al. (1997) Use of ultrasound in the detection of vesico-ureteral reflux in children suspected of having urinary tract infection. J Clin Ultrasound 25:195-199
83. Riccabona M, Ring E, Mileder P (1991) Sonographie beim Harnwegsinfekt im Säuglingsalter. Klin Padiol 203:372-376
84. Robben SGE, Boesten M, Linmans J et al. (1999) Significance of thickening of the wall of the renal collecting system in children. A US study. Pediatr Radiol 29:736-740
85. Sorantin E, Fotter R, Aigner R, Ring E, Riccabona M (1997) The sonographically thickened wall of the upper urinary tract: correlation with other imaging methods. Pediatr Radiol 27:667-671
86. Schneider K, Jablonski C, Wiessner M, Kohn M, Fendel H (1984) Screening for vesicoureteral reflux in children using real-time sonography. Pediatr Radiol 14:400-403
87. Haberlik A (1998) Detection of low-grade vesicoureteral reflux in children by color Doppler imaging mode. Pediatr Surg Int 12:38-43
88. Matsumo T, Fukushima Motoyama H, Higushi E et al. (1996) Color flow imaging for detection of vesicoureteral reflux. Lancet 347:757
89. Salih M, Baltaci S, Kilic S et al. (1994) Color flow Doppler ultrasound in the diagnosis of vesicoureteral reflux. Eur Urol 26:93-97
90. Alzen G, Wilberger JE, Ferris EJ et al. (1994) Ultrasound detection of vesico-ureteral reflux with air. Eur Radiol 4:142-145
91. Hanbury DC, Coulden RA, Farman P, Sherwood T (1990) Ultrasound cystography in the diagnosis of vesico-ureteral reflux. J Urol 65:250-253
92. Ascenti G, Chimenz R, Zimbaro G et al. (2000) Potential role of colour-Doppler cystosonography with echo-contrast in the screening and follow-up of vesicoureteral reflux. Acta Pediatr 89:1336-1339
93. Atala A, Wible JH, Share LC, Carr MC, Retic AB, Mandel J (1993) Sonography with sonicated albumin in the detection of vesico-ureteral reflux. J Urol 150:756-758
94. Beyer HJ, Hofman V, Brettschneider D (1985) The micturition sonourogram: a new possibility for determining vesicorenal reflux in children. Ultraschall Med 6:182-188
95. Bosio M (1998) Cystosonography with echocontrast: a new imaging modality to detect vesico-ureteric reflux in children. Pediatr Radiol 28:250-255
96. Darge K, Tröger J, Duetting T et al. (1999) Reflux in young patients: comparison of voiding ultrasound of the bladder and the retrovesical space with echo-enhancement versus voiding cystourethrography for diagnosis. Radiology 210:201-207
97. Kenda RB, Novljan G, Kenig A, Hojker S, Fettich JJ (2000) Echo-enhanced ultrasound voiding cystography in children: a new approach. Pediatr Nephrol 14:297-300
98. Radmayr C, Klauser A, Pallwein L, Zurnedden D, Bartsch G, Frauscher F (2002) Contrast enhanced reflux sonography in children: a comparison to standard radiological imaging. J Urol 167:1428-1430
99. Darge K, Zieger B, Rohrschneider W, Ghods S, Wunsch R, Troeger J (2001) Contrast-enhanced harmonic imaging for the diagnosis of vesicoureteral reflux in pediatric patients. Am J Roentgenol 177:1411-1415
100. Good CD, Vinnicombe SJ, Minty IL et al. (1993) Posterior urethral valves in male infants and newborns: detection with US of the urethra before and during voiding. Radiology 198:387-391
101. Hulbert WC, Rosenberg HK, Cartwright PC et al. (1992) The predictive value of ultrasound in evaluation of infants with posterior urethral valves. J Urol 148:122-124
102. Williams CR, Perez LM, Joseph DB (2001) Accuracy of renal and bladder ultrasonography as a screening method to suggest posterior urethral valve. J Urol 165:2245-2247
103. Teele RL, Share JC (1997) Transperineal sonography in children. Am J Roentgenol 168:1263-1267
104. Riccabona M, Fritz G, Pilhatsch A, Mache CJ, Sorantin E, Ring E (2001) Potential of three-dimensional ultrasound (3DUS) in the pediatric urinary tract. Eur Radiol 11:D13-D14
105. Riccabona M, Fritz G, Bodahl E, Ring E (2002) Three-dimensional ultrasound in the paediatric urinary tract: preliminary experience. Eur Radiol 12 (Suppl):475
106. Avni EF, Hall M, Schulman CC (1988) Congenital uro-nephropathies: Is routine voiding cysto-urethrography always warranted? Clin Radiol 53:247-250
107. Decter RM, Roth DR, Gonzales ET (1988) Vesicoureteral reflux in boys. J Urol 140:1089-1091
108. Morin L, Cendron M, Crombleholme M et al. (1996) Minimal hydronephrosis in the fetus: clinical significance and implications for management. J Urol 155:2047-2049
109. Noe NH (1995) The current status of screening for vesicoureteral reflux. Pediatr Nephrol 9:638-641
110. Noe H (1992) The long term results of prospective sibling reflux screening. J Urol 148:1739-1742
111. Wan J, Greenfield SP, Ng M, Zerin M et al. (1996) Sibling reflux: a dual center retrospective study. J Urol 156:677-679
112. Poli-Merol M, Francois S, Pfliger F et al. (1998) Interest of direct radionuclide cystography in repeated urinary tract infection exploration in children. Eur J Pediatr Surg 8:339-342
113. Arant BS (1992) Medical management of mild and moderate vesicoureteral reflux: follow-up study of infants and young children. A preliminary study of the southwest pediatric nephrology study group. J Urol 148:1683-1687
114. Balbay MD, Ozsan O, Ozbeck E, Ozkan S, Gunes A (1998) Comparison of screening of vesico-ureteral reflux with renal ultrasound and voiding cystourethrography. Urol Nephrol 30:263-266
115. Jodal U, Hansson S, Hjälmas K (1999) Medical or surgical management for children with vesico-ureteric reflux? Acta Pediatr 431:S53-S61
116. Farnsworth RH, Rossleigh MA, Leighton DM et al. (1991) The detection of reflux nephropathy in infants by Tc DMSA studies. J Urol 145:542-546
117. Merguerian PA, Jamal MA, Agarwal SK et al. (1999) Utility of DMSA scanning in the evaluation of children with primary VUR. Urology 53:1024-1028
118. Dacher JN, Pfister C, Monroc M, Eurin D, LeDoneur P (1996) Power Doppler sonographic pattern of acute pyelonephritis in children: comparison with CT. Am J Roentgenol 166:1451-1455
119. Kim B, Lim HK, Choi MH et al. (2001) Detection of parenchymal abnormalities in acute pyelonephritis by pulse inversion harmonic imaging with or without microbubble ultrasonographic contrast agent: correlation with computed tomography. J Ultrasound Med 20:5-14
120. Riccabona M, Schwinger W, Ring E, Aigner R (2001) Amplitude coded color Doppler sonography in pediatric renal disease. Eur Radiol 11:861-866
121. Winter DW (1996) Power Doppler sonographic evaluation of acute pyelonephritis in children. J Ultrasound Med 15:91-96
122. Borthne A, Nordshus T, Reiseter T et al. (1999) MR urography: the future gold standard in pediatric urogenital imaging? Pediatr Radiol 29:694-701
123. Lonergan GJ, Pennington DJ, Morrison JC, Haws RM, Grimley MS, Kao TC (1998) Childhood pyelonephritis: comparison of gadolinium-enhanced MR imaging and renal cortical scintigraphy for diagnosis. Radiology 207:377-384
124. Majd M, Nussbaum Blask AR, Markle BM et al. (2001) Acute pyelonephritis: comparison of diagnosis with 99m Tc-DMSA SPECT, spiral CT, MR imaging, and power Doppler US in an experimental pig model. Radiology 218:101-108
125. Hernandez RH, Goodsitt M (1996) Reduction of radiation dose in pediatric patients using pulsed fluoroscopy. Am J Roentgenol 167:1247-1253
126. Kleinman PK, Diamond DA, Karellas A et al. (1994) Tailored low dose fluoroscopic voiding cystourethrography for the reevaluation of vesicoureteral reflux in girls. Am J Roentgenol 162:1151-1156
127. Leibovic SJ, Lebowitz RL (1980) Reducing patient dose in voiding cystourethrography. Urol Radiol 2:103-107
128. Berrocal T, Gaya F, Arjonilla A, Lonergan GJ (2001) Vesicoureteral reflux: diagnosis and grading with echoenhanced cystosonography versus voiding cystourethrography. Radiology 221:359-365
129. Valenti AL, Salvaggio E, Manzoni C et al. (2001) Contrast-enhanced gray-scale and color Doppler voiding urosonography versus voiding cystourethrography in the diagnosis and grading of vesicoureteral reflux. J Clin Ultrasound 29:65-71
130. Darge K, Ghods S, Zieger B, Rohrschneider W, Tröger J (2001) Reduction in voiding cysto-urethrographies after introduction of contrast enhanced sonographic reflux diagnosis. Pediatr Radiol 31:790-795
131. Goldman M, Lahat E, Strauss S et al. (2000) Imaging after urinary tract infection in male neonates. Pediatrics 195:1232-1235
132. Mahant S, To T, Friedman J (2001) Timing of voiding cystourethrogram in the investigation of urinary tract infections in children. J Pediatr 139:568-571
133. Mouriquand PDE, Troisfontaines E, Wilcox DT (1999) Antenatal and perinatal uronephrology: current questions and dilemmas. Pediatr Nephrol 13:939-944
134. Manunta A, Patard JJ, Guille F et al. (2001) Recurrent pyelonephritis without vesicoureteral reflux: Is there a role for an antireflux procedure? J Endourol 15:707-710