Sonography of the puerperal uterus.

Thirty-seven patients who delivered singleton pregnancies were followed by serial sonograms during the first 2 weeks of the puerperal period to evaluate uterine involution. Significant correlation was found between birthweight and uterine size during this period. No correlation was found between regressing uterine size and route of delivery, parity, or method of infant feeding. Variations in normal uterine, endometrial, and adnexal appearance are described as knowledge of these changes is necessary to appreciate pathologic conditions.