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Endometrial hyperplasia is a condition of excessive proliferation of the cells of the endometrium, or inner lining of the uterus.. Most cases of endometrial hyperplasia result from high levels of estrogens, combined with insufficient levels of the progesterone-like hormones which ordinarily counteract estrogen's proliferative effects on this tissue.
They are a subset of a larger mixed group of lesions previously called "endometrial hyperplasia". [ 2 ] [ 3 ] The EIN diagnostic schema is intended to replace the previous " endometrial hyperplasia " classification as defined by the World Health Organization in 1994, which have been separated into benign (benign endometrial hyperplasia) and ...
Endometrial hyperplasia – Hyperproliferation of the endometrium, usually in response to unopposed estrogen stimulation in the setting of polycystic ovary syndrome or exogenous administration of hormones. Atypical endometrial hyperplasia may represent an early neoplastic process which can lead to endometrial adenocarcinoma. [20]
An atypical hyperplasia is one with visible abnormalities in the nuclei. Pre-cancerous endometrial hyperplasias are also referred to as endometrial intraepithelial neoplasia. [41] Mutations in the KRAS gene can cause endometrial hyperplasia and therefore Type I endometrial cancer. [37] Endometrial hyperplasia typically occurs after the age of ...
Squamous metaplasia may be seen in the context of benign lesions (e.g., atypical polypoid adenomyoma), chronic irritation, or cancer (e.g., endometrioid endometrial carcinoma), as well as pleomorphic adenoma.
Metropathia haemorrhagica, also known as metropathia haemorrhagica cystica, is a menstrual disorder which is defined as a specialized type of anovulatory dysfunctional uterine bleeding associated with endometrial hyperplasia and intermenstrual bleeding.
Uterine hyperplasia, or enlarged uterus, is a medical symptom in which the volume and size of the uterus in a female is abnormally high. It can be a symptom of medical conditions such as adenomyosis , uterine fibroids , ovarian cysts , and endometrial cancer .
This case closely resembles normal surface endometrial epithelium of the uterus. Histopathology of the typical features of an ovarian serous borderline tumor : Hierarchical branching, exfoliated cell clusters, calcifications, up to moderate atypia, and pseudostratified, crowded epithelium with hobnailing.