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Produced: 03/31/2026 7:40 AM
Question 20250001
Inquiry Details
References:
#1: WHO Class Female Genital Tumors, online. 5th edition
#2: Glossary; NCI Definitions of Cancer Terms
Question:
Reportability/Histology--Endometrium: Are the following terms and diagnoses synonymous with endometrioid intraepithelial neoplasia (EIN) and therefore reportable?
1. Atypical glandular epithelium
2. Isthmic-type mucosa with focal severe atypia
3. Simple hyperplasia without atypia
4. EIN/complex atypical hyperplasia (EIN/CAH) or focal EIN/CAH (on biopsy but the resection pathology or operative note states no EIN/CAH/atypical hyperplasia)
Discussion:
We have questions regarding reportability of some terms/diagnoses after a review of EIN cases back to 2021. While some seem synonymous with EIN, others have different terms in the pathology report though the physician is treating as if they have the diagnosis.
1. Atypical glandular epithelium
Scenario: Endometrium biopsy with ablation performed at Facility A on 8/7/2024 showed atypical glandular epithelium. Patient was sent to Facility B where the total abdominal hysterectomy/bilateral salpingo-oophorectomy (TAH/BSO) on 9/20/2024 showed other reactive fibrosis and obliterated architecture compatible with history of ablation. Is atypical glandular epithelium synonymous with and coded as EIN?
2. Isthmic-type mucosa with focal severe atypia
Scenario: Endometrium biopsy showed isthmic-type mucosa with focal severe atypia. Then Facility B did TAH/BSO that showed no evidence of high grade dysplasia, atypical hyperplasia, or carcinoma.
3. Simple hyperplasia without atypia
Scenario: Endometrial biopsy pathology states simple hyperplasia without atypia and the TAH/BSO is either negative or has the same histology; however, the treating physician is stating EIN.
4. EIN/CAH or focal EIN/CAH
Scenario: Biopsy showed EIN/CAH but the total abdominal hysterectomy/bilateral salpingo-oophorectomy (TAH/BSO) pathology or the Mirena IUD treatment operative note states no EIN/CAH/Atypical hyperplasia. Are these reportable, similar to an in situ when the re-excision lumpectomy or mastectomy is negative or no residual disease?
Answer:
Reportability for EIN became effective in 2021.
1. Do not report atypical glandular epithelium. Atypical glandular epithelium, also referred to as atypical glandular cells (AGC), refers to abnormal looking cells that may be found in the tissue lining the inside of the endometrium or the cervix. While not malignant (in situ or invasive), they can be associated with a range of lesions in the female reproductive system.
2. Do not report isthmic-type mucosa with focal severe atypia. The NCI data dictionary defines atypia as an abnormality in cells in tissue. Report the case when further defined as atypical hyperplasia.
3. Do not report simple hyperplasia without atypia. WHO Classification of Tumors online, Female Genital Tumors (5th ed.), defines endometrial hyperplasia without atypia as a proliferation of endometrial glands of irregular size and shape without significant atypia. There is no ICD-O code for this term. Simple endometrial hyperplasia without atypia is an acceptable related term for endometrial hyperplasia without atypia. Pathology has priority over a physician statement.
4. Report EIN/CAH or focal EIN/CAH (8380/2) based on the biopsy. WHO Classification of Tumors online, Female Genital Tumors (5th ed.), defines EAH/EIN as a simultaneous change of epithelial cytology and an increased number of endometrial glands in a defined region. The preferred term is atypical hyperplasia of the endometrium; terms not recommended include complex atypical endometrial hyperplasia; simple atypical endometrial hyperplasia; endometrial intraepithelial neoplasia.
