Neonatal uterine morphology as seen on real-time US.
The uterus in the neonate is prominent and readily identified on ultrasonography (US). The neonatal uterus is larger than the prepubertal uterus as a result of residual stimulation from maternal hormones. The uterus was visualized in 31 of 35 (89%) infant girls examined with real-time US. Mean uterine length was 3.4 cm. The majority of the uteri were tubular or spade-shaped, with the anteroposterior diameter of the cervix equal to or greater than the anteroposterior diameter of the fundus. The endometrial cavity was visualized in 30 (97%), a myometrial halo in nine (29%), and a small amount of endometrial fluid in seven (23%) of the uteri.
D002584:Cervix Uteri / Q000033:anatomy & histology; D004717:Endometrium / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D012016:Reference Values; D014463:Ultrasonography / Q000379:methods*; D014599:Uterus / Q000033:anatomy & histology*