Ultrasonic evaluation of the normal uterus in the neonate.

Using real-time ultrasound, a study was undertaken to evaluate the morphology of normal uterus in the neonate delivered at term. The uterus was visualized in 41 (89.1%) of the 46 neonates. The cervical volume (CE-V) was 3.65 +/- 1.36 cm3, the corporeal volume (CO-V) 1.18 +/- 0.42 cm3, and the CE-V was significantly larger than the CO-V (p less than 0.001). The uterine volume (U-V) was 4.83 +/- 1.57 cm3, and U-V showed a good correlation with birth weight (r = 0.42, p less than 0.01). The endometrial echo was constantly depicted as a mixed echo of a highly echogenic line and/or a myometrial halo. These normal values and the morphology of the neonatal uterus provide useful information for distinguishing a possible pathologic pelvic mass and screening of congenital genital disorders.