Cystic endosalpingiosis is part of müllerianosis, disorders consisting in the heterotopic presence of müllerian-derived tissue [1, 2] in pelvic organs like the uterus , bladder , ovaries , parametrium , uterosacral mesosalpinx , peritoneum , and ureters  or in distant locations like the small  and large intestine (especially in the appendix) , coledochal duct , axillary nodes , mediastinum , umbilicus , vessels , and spine .