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The case report describes the management of endometriotic cysts in a woman taking adjuvant tamoxifen. A diagnosis of endometriosis was made at the age of 38, and the condition was initially managed with a low-dose estrogen-progestogen combination; the patient then switched to dienogest at the age of 45. Following a diagnosis of breast cancer at the age of 46, dienogest was stopped and adjuvant tamoxifen treatment started. After 4 months the patient was diagnosed with bilateral ovarian cysts and underwent laparoscopic bilateral salpingo-oophorectomy. Endometriosis was diagnosed in both ovaries on histopathological examination. This case report describes progression of endometriosis in a tamoxifen user.