VP62.10: The prevalence of endometriosis in pregnancy: a prospective ultrasound study

To examine the prevalence of endometriosis in a population of women attending a dedicated early pregnancy unit that underwent detailed pelvic ultrasound examination. This was a prospective observational cohort study conducted in our dedicated early pregnancy unit over a period of 24 months. We included all consecutive women who were scanned by a single experienced operator. Outcomes of interest included location and viability of the pregnancy. The pelvis was then examined to determine the presence and location of endometriotic lesions and other concomitant gynecological diagnoses. We included 1442 consecutive women who attended our dedicated early pregnancy unit. 101 women were excluded from the data analysis as they did not undergo a transvaginal ultrasound scan. 1216 (91%) of women had an intrauterine pregnancy and 67 (5%) had an ectopic pregnancy. 105 (8%) of women had a diagnosis of endometriosis. 33 (50%) of women had evidence of endometriotic cysts, 57 (86%) had evidence of endometriotic nodules and 24 (36%) had both cysts and nodules. Of the 66 women with evidence of deep endometriosis, 17 (26%) had evidence of bowel involvement and 2 (3%) had evidence of bladder involvement. A diagnosis of endometriosis was significantly associated with the presence of fibroids (p = 0.002), adenomyosis (p = 0.028) and uterine anomalies (p = 0.009). Endometriosis is a common condition in pregnancy and is often diagnosed during early pregnancy ultrasound examination. This study demonstrated 8% prevalence of endometriosis in pregnant women and its presence was significantly associated with concomitant findings of uterine fibroids, congenital uterine anomalies and adenomyosis.