|Types||Sub Types||features||Risk of progression to adenocarcinoma|
|Simple Hyperplasia||Simple hyperplasia without atypia
(cystic glandular hyperplasia)
|Varying size glands some of which are cystically dilated.
Dilated glands lined by atrophic epithelium.
|Less than 1 %|
|Simple hyperplasia with atypia||Similar to above but the epithelial cells show nuclear atypia in the form of loss of polarity, vesicular nuclei with prominent nuclei||8%|
|Complex Hyperplasia||Complex hyperplasia without atypia||The number and size of glands are increased. Crowding and branching of glands are seen. The lining epithelium can be multilayered but there is no atypia||3%|
|Complex hyperplasia with atypia||Artchitecturally similar to above but show cellular atypia. The atypia may be mild, moderate or sevre.loss of polarity , irregular hyperchromatic nuclei and prominent nucleoli.||20-25%|