The occurrence of mitotic irregularities during a normal epithelial proliferation.
D000818:Animals; D002584:Cervix Uteri / Q000166:cytology; D004847:Epithelial Cells; D005260:Female; D051379:Mice; D008858:Microscopy, Phase-Contrast; D008938:Mitosis; D014621:Vagina / Q000166:cytology