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Endosalpingiosis is a benign condition characterized by the presence of tubal epithelium outside the fallopian tube and the absence of endometrial stroma. Florid cystic endosalpingiosis is a very rare form of endosalpingiosis that presents as a tumor-like lesion. We report the case of a 67-year-old woman who presented with a cystic lesion of the uterus. Macroscopically, a cut section revealed a multicystic, whitish mass in the myometrium of the fundus. Histologically, the lesion consisted of numerous variably sized glands that were lined with a single or stratified layer of ciliated columnar cells similar to tubal epithelium.