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Hydatidiform mole (HM) is rare in postmenopause, with only 7 cases reported. The occurrence of ectopic HM is also rare, with 26 fully documented tubal cases. We are not aware of any reported cases of ectopic HM in a postmenopausal patient. In a 51-year-old patient with 3 years amenorrhea, surgery revealed a necrotic, hemorrhagic mass involving the right peritubal space. Microscopically, chorionic villi were seen within the hemorrhagic mass accompanied by circumferential trophoblast hyperplasia. Immunohistochemically, p57(kip2) positive nuclei were prominent in the extravillous (intermediate) trophoblast. The HER2 FISH expression was diploid, consistent with the diagnosis of an early complete HM.