An endometrial hyperplasia characterized by cytologic and architectural changes which may lead to endometrial carcinoma. Despite the atypical features and possible course, there is debate on whether to consider this a neoplasm. The relationship with endometrial intraepithelial neoplasia is also unclear. The disease is atypical endometrial hyperplasia (MONDO_0006096). Also known as: atypical hyperplasia of endometrium, atypical hyperplasia of the endometrium, endometrial hyperplasia with atypia.