Endometrial hyperplasia is defined as endometrial proliferation with an increase in gland to stroma ratio (from 2:1 to 3:1). It is divided into Simple hyperplasia (with or without atypia) and Complex hyperplasia (with or without atypia) according to the WHO Classification. The image shows a proliferation of dilated endometrial glands with no or minimal outpouchings. It is an example of simple hyperplasia without atypia.
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