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Figure 1. Hematometrocolpos diagnosed in a fetus at 35 weeks of gestation. A. Antenatal transverse ultrasound scan showing the fetal pelvic mass between the calipers (3.67 cm). B. Postnatal longitudinal ultrasound scan of the baby’s pelvis confirming the hematometrocolpos on the day of birth. C. Longitudinal ultrasound scan of the baby’s pelvis at three months of age showing normal anatomy and complete resolution of the hematometrocolpos. The uterus is shown between the calipers (2.57 cm).