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Walk the evidence base by book and chapter — the raw source passages that ground Ask, Differential, and the rest.
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Congenital Megaureter Presenting in an Adult as a Vaginal Wall Cyst. BACKGROUND: Vaginal cysts are a common finding. The differential diagnosis includes epidermal inclusion, Bartholin gland, Gartner duct, and Skene gland cysts and Müllerian anomalies. Rarely, leiomyomas, cancers, or ectopic ureters or megaureters are found. CASE: A 31-year-old woman, gravida 3 para 3, presented with a 12-year history of intermittent abdominal pain and involuntary loss of urine. She was diagnosed with ectopic vaginal megaureter after evaluation and subsequently underwent a nephroureterectomy with a marsupialized distal ureter. She remains asymptomatic. CONCLUSION: Consideration of a rare diagnosis such as an ectopic ureter is important when patients repeatedly present with involuntary urinary incontinence in conjunction with a vaginal cyst and an otherwise negative evaluation. Using magnetic resonance imaging can be useful to assess urinary tract involvement, particularly in patients with known urinary tract malformations.