Gu F, et al. - A prospective cohort study was done to compare the recurrence rates of premenopausal patients with multiple and single endometrial polyp (EP) and to identify prognostic factors for their recurrence potential. Based on these outcomes, multiple polyps, endometriosis and history of EPs were related to a greater potential for polyp recurrence after hysteroscopic polypectomy. Patients with excessive growth of multiple EPs were much more vulnerable to polyp recurrence than those with a single polyp, showing that these two different types of polyps may possibly arise by a different etiology and pathogenesis.