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Anatomic changes in the pelvis after uncomplicated vaginal delivery: evaluation with serial MR imaging
A B Willms1, E D Brown, U I Kettritz
1Department of Radiology, University of North Carolina, Chapel Hill 27599.
Purpose:
To demonstrate the normal involution process of the post-partum pelvis with serial magnetic resonance (MR) imaging.
Materials And Methods:
MR imaging was performed in 14 women after uncomplicated vaginal delivery. Six women underwent serial MR examinations at less than 30 hours and at 1 week, 2 weeks, 6 weeks, and 6 months after delivery; eight women were examined only within 30 hours of delivery. The dimensions and signal intensity of the uterus and cervix and the appearance of other pelvic structures were evaluated.
Results:
The mean length of the uterine corpus was 13.8 cm within 30 hours of delivery and 5.0 cm at 6 months. The mean length of the cervix was 5.6 cm within 30 hours of delivery and 2.9 cm at 6 months. The junctional zone was not visible before 2 weeks; however, it was visible in all cases at 6 months. The outer cervical stroma had high signal intensity less than 30 hours after delivery and intermediate signal intensity thereafter. The inner cervical stroma was visible as a low-signal-intensity stripe on all images.
Conclusion:
Knowledge of the normal MR appearance of the involuting postpartum pelvis provides a baseline for interpretation of MR images obtained during this period.