Development of deep pelvic endometriosis following acute haemoperitoneum: a prospective ultrasound study.

Study Question: Is acute haemoperitoneum that is managed conservatively a precursor of deep endometriosis?

Summary Answer: Our study provides evidence to suggest that acute haemoperitoneum may lead to the development of deep endometriosis in a significant proportion of cases.

What Is Known Already: A recent pilot study was the first to suggest that acute haemoperitoneum could be a precursor of deep endometriosis. However, the sample size was small, and the follow-up was not standardized owing to unknown rates of clot absorption and development of endometriosis.