We present a patient having an endometrial carcinoma with an incidental finding of hilus cells in the tuba uterina. To our knowledge this is the first report of an incidental finding of hilus cells in the fallopian tube coincident with an endometrial carcinoma. No gross abnormality was seen in the salpinges, but microscopic examination showed scattered aggregates of hilus cells beneath a normal tubal epithelium. Both ovaries showed prominent hilus cells in the hilus also. Immunohistochemical findings were as follows; inhibin, calretinin, Melan A, vimentin were positive and EMA, CD99 were negative. Both microscopic and immunohistochemical features were identical to hilus cells of the ovary. So immunohistochemistry may be a useful tool to differentiate the extra-ovarian hilus cells from their mimics.