The cytological characteristics of endometrial cells are seen as ball like tight spherical clusters. Single discrete endometrial cells are rare. The cells are same size as that of nuclei of the intermediate cells. Nuclei are small and round or bean shaped. Endometrial cells are exfoliated in several conditions such as menstruation, endometritis, endometriosis, endometrial polyp, submucosal leiomyoma, intrauterine instrumentation, tamoxifen therapy, and endometrial adenocarcinoma. The endometrial cells are normally exfoliated during menstruation. The cells are found on cervical smear from 6-10th day of the menstrual cycle. The presence of endometrial cells after 12th day of the menstrual cycle is unusual and commonly associated with endometritis or endometrial polyp. The endometrial cells during menstrual cycle appear as exodus.