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File:Histopathology of non-complex endometrial polyp without atypia.jpg|Histopathology of non'''Non-complex endometrial polyp without atypia''', with a thick-walled blood vessel in middle.File:Histopathology of non-complex endometrial polyp without atypia, with tubal metaplasia.jpg|Histopathology of non'''Non-complex endometrial polyp without atypia''', with tubal metaplasia (black arrow) and a thick-walled blood vessel (white arrow). The stroma is hemorrhagic.File:Histopathology of complex hyperplasia without atypia.jpg|Histopathology of complex '''Complex hyperplasia without atypia''': Cystically dilated endometrial glands lined by a single layer of columnar epitheliumFile:Histopathology of complex hyperplasia with atypia.jpg|Histopathology of complex '''Complex hyperplasia with atypia''': Closely packed endometrial glands with sparse intervening stroma and stratification of the lining epithelium. Epithelial cells show cytological atypia with high nucleocytoplasmic ratio, irregular clumping of nuclear chromatin, and mitotic figures.