The World Health Organisation (WHO) classification of tumours of the uterine corpus is a commonly used classification system for uterine tumours. It is part of the 5th edition WHO classification of female genital tumours, published in 2020 1.
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Classification
Endometrial epithelial tumours and precursors
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precursor lesions
endometrial hyperplasia without atypia
endometrial atypical hyperplasia / endometrioid intraepithelial neoplasia
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endometrial carcinomas: most common of all uterine malignancies (>90%)
endometrioid carcinoma: most common histological subtype
serous carcinoma: ~10%
clear cell carcinoma: <10%
mixed carcinoma: ~10%
other endometrial carcinomas: rare (includes mesonephric adenocarcinoma (~1%), mesonephric-like adenocarcinoma, squamous cell carcinoma (<5%), mucinous carcinoma)
carcinosarcoma: previously known as a malignant mixed Müllerian tumour (~5% of all uterine malignancies)
Tumour-like lesions
endometrial metaplasia
Mesenchymal tumours of the uterus
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smooth muscle tumours
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endometrial stromal and related tumours
endometrial stromal nodule
low-grade endometrial stromal sarcoma
high-grade endometrial stromal sarcoma
undifferentiated uterine sarcoma
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miscellaneous mesenchymal tumours
uterine tumour resembling ovarian sex cord tumour
other mesenchymal tumours of the uterus: rare (includes vascular tumours, lipomatous tumours, alveolar soft part sarcoma, solitary fibrous tumour, nerve sheath tumours, NTRK sarcomas, giant cell tumour)
Mixed epithelial and mesenchymal tumours
atypical polypoid adenomyoma
adenosarcoma of the uterus
Miscellaneous tumours
central primitive neuroectodermal tumour (PNET) / CNS embryonal tumour
Related pathology
Tumours involving the uterus but classified elsewhere (i.e. not of the uterine corpus):
gestational trophoblastic disease: including gestational choriocarcinoma
uterine lymphoma: rare (primary or secondary)
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local invasion from other tumours:
metastases to the uterus: rare