Bladder wall thickness is remarkably uniform in patients with nonneurogenic voiding dysfunction. Therefore, it cannot reliably predict bladder outlet obstruction or detrusor overactivity. Bladder wall thickness measurement does not provide an alternative to urodynamic studies for diagnosing voiding dysfunction.

indicating that the rod was not actually present. Serum levels in the third case confirmed presence of the device, but we were unable to locate it. In our series ultrasound provided a 97% positive predictive value and a 66.6% negative predictive value in the detection of an impalpable, but truly present, Implanon rod. Conclusion: Ultrasound is an important modality in the localization and removal of impalpable, but present, Implanon rods. A serum etonorgestrel should be performed in the circumstance of an impalpable rod and a negative ultrasound, as the device may not actually be present.

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