Falsely Elevated Postvoid Residual Urine Volume in Uterine Myoma

Area of Science:

• Urology
• Diagnostic Imaging
• Gynecology

Background:

• Accurate postvoid residual (PVR) urine volume measurement is essential for evaluating voiding dysfunction and lower urinary tract issues.
• Ultrasound bladder scanning is a safe, noninvasive method for PVR assessment.
• Known causes of false-positive PVR ultrasound readings include ovarian cysts, renal cysts, ascites, and cystic uterine myomas, with a false-positive rate up to 9%.

Purpose of the Study:

• To report on two cases where non-cystic uterine myomas led to falsely elevated PVR measurements.
• To expand the understanding of potential confounding factors in ultrasound-based PVR volume assessment.

Main Methods:

• Retrospective review of two patient cases with falsely elevated PVR measurements.
• Detailed analysis of radiologic images, specifically ultrasound findings.
• Comparison of PVR volume data in the context of uterine myoma characteristics.

Main Results:

• Two cases identified where non-cystic uterine myomas were associated with falsely elevated PVR readings.
• This finding contrasts with the established understanding that only cystic lesions cause such inaccuracies.
• Radiologic images and volume data were collected to support the findings.

Conclusions:

• Non-cystic uterine myomas should be considered as a potential cause of falsely elevated PVR measurements via ultrasound.
• Clinicians should be aware of this possibility to avoid misdiagnosis in patients with voiding dysfunction.
• Further investigation may be warranted to understand the mechanism behind this phenomenon.