Fig. 3

Prenatal and postnatal ultrasound findings of congenital imperforate hymen. Images arrayed in the first to fourth columns represent the ultrasound findings of mass, bladder, UA (umbilical artery), and anus in different gestational weeks. Prenatal ultrasound images: images arrayed in the first to the third row represent the ultrasound findings of 34, 34^+ 5, and 38 weeks of gestation respectively (a to l); Postnatal observations: perineum and anus of the newborn (m), ultrasonography at 1 day after birth (n), open drainage of hydrometrocolpos (o), ultrasonography at 3 days after treatment (p)