Urodynamics findings pre- and post-untethering surgery in children with filum lipoma: A single-institution experience

Objectives We aimed to investigate the changes in urodynamics and voiding cystourethrogram parameters on pre- and post-untethering surgery in patients aged under 2 years with filum lipoma. Methods Sixty-two patients were enrolled in this study. The changes in urodynamics and voiding cystourethrogram parameters were compared before untethering surgery and 6 months after untethering surgery. These parameters were bladder volume, bladder deformity, vesicoureteral reflux during voiding cystourethrogram, detrusor overactivity, bladder compliance, and post-void residual volume in urodynamics. Results Bladder volume during voiding cystourethrogram and bladder compliance increased significantly from 89.8 +/- 49.5 mL to 114.5 +/- 50.5 mL (P = 0.0069) and 10.2 +/- 6.2 mL/mmH(2)O to 17.0 +/- 13.3 mL/mmH(2)O (P = 0.0008), respectively, at 6-month follow-up. Six patients required combination management with clean intermittent catheterization at 25.1 +/- 8.2 months (14.3 +/- 6.5-months follow-up) because of elevated post-void residual volumes. Conclusions According to voiding cystourethrogram results, bladder function and urodynamics in patients with filum lipoma significantly improved after untethering surgery. Non-invasive assessment based on measurements of post-void residual should be considered as a postoperative follow-up method.