The incidence of neoplasm of uncertain behavior of uterus diagnosed after surgery for presumed leiomyoma: A national population-based study.

Regardless of the surgical procedure performed, the incidence of NUBU diagnosed after surgery was higher than that of unexpected uterine malignancy diagnosed after hysterectomy (0.19%), myomectomy (0.12%), or hysteroscopic myomectomy (0.86%) for presumed leiomyoma. Compared with unexpected uterine malignancy, NUBU seems to occur in relatively young women.