Obstetrical Outcomes of Ultrasound Identified Uterine Fibroids in Pregnancy

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We aimed to determine if fibroids in pregnancy, categorized by size, are associated with adverse obstetrical outcomes.

Study Design

Demographic, clinical, and delivery data were collected from charts of women with singleton gestations who delivered at >20 weeks gestation with fibroids identified at routine anatomy scan and their randomly selected age-matched controls. Largest fibroid diameter was used to categorize small fibroids (≤5 cm) and large fibroids (>5 cm).


We included 450 patients: 264 patients with fibroids (174 small, 90 large fibroids) and 186 age-matched controls. Women with large fibroids had significantly greater blood loss than women with small fibroids and women with no fibroids (p-value <0.0001 and <0.0001 after adjusting for delivery mode). When fibroid size was compared individually, there was a significantly higher rate of primary cesarean section in both small and large fibroid groups when compared with women with no fibroids (p-values 0.044 and 0.003 after adjusting for body mass index).


Women with fibroids in pregnancy have higher rates of primary cesarean delivery and are at significant risk for increased blood loss at the time of delivery.

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