Abdominal Tumor on Fetus

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• 28-yr-old pregnant woman at 30 wk gestational age presents for evaluation because of prenatal ultrasound of fetus with concern for abdominal tumor.
• Ultrasound was repeated 6 wk after the initial ultrasound. On repeat ultrasound at 36 wk, the mass is noted to be in the pelvis, posterior to the bladder identified to be hydrocolpos.
• MRI was obtained to help identify the anatomy.