A 30-year-old (G3P1) was referred at 35 weeks of gestation for sonographic evaluation due to a suspicion of anorectal malformation with normal second trimester anomaly scan.
Ultrasound examination in our center revealed the following findings:
A central tubular cystic structure contains internal echo which was located posterior to bladder and anterior to the normal appearing rectum. The fetal sex was female and the target sign of anus seems to be normal.
Both kidneys had normal location. Our preliminary diagnosis based on the US findings was hydrocolpos due to imperforated hymen which was confirmed by postnatal evaluation.
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