An International Terminology for Endometriosis, 2021

International Working Group of AAGL; ESGE, ESHRE and WES, C. Tomassetti; Tomassetti, C; Johnson, NP; Petrozza, J; Abrao, MS; Einarsson, JI; Horne, AW; Lee, TTM; Missmer, S; Vermeulen, N; Grimbizis, G; Zondervan, KT; De Wilde, RL

Journal article

An International Terminology for Endometriosis, 2021

Abstract:: Background: Different classification systems have been developed for endometriosis, using different definitions for the disease, the different subtypes, symptoms and treatments. In addition, an International Glossary on Infertility and Fertility Care was published in 2017 by the International Committee for Monitoring Assisted Reproductive Technologies (ICMART) in collaboration with other organisations. An international working group convened over the development of a classification or descriptive system for endometriosis. As a basis for such system, a terminology for endometriosis was considered a condition sine qua non.

Objectives: The aim of the current paper is to develop a set of terms and definitions on endometriosis that would be the basis for standardisation in disease description, classification and research.

Materials and Methods: The working group listed a number of terms relevant to be included in the terminology, documented currently used and published definitions, and discussed and adapted them until consensus was reached within the working group. Following stakeholder review, further terms were added, and definitions further clarified. Although definitions were collected through published literature, the final set of terms and definitions is to be considered consensus-based. After finalisation of the first draft, the members of the international societies and other stakeholders were consulted for feedback and comments, which led to further adaptations.

Results: A list of 49 terms and definitions in the field of endometriosis is presented, including a definition for endometriosis and its subtypes, different locations, interventions, symptoms and outcomes. Endometriosis is defined as a disease characterised by the presence of endometrium-like epithelium and/or stroma outside the endometrium and myometrium, usually with an associated inflammatory process.

Conclusions: The current paper outlines a list of 49 terms and definitions in the field of endometriosis. The application of the defined terms aims to facilitate harmonisation in endometriosis research and clinical practice. Future research may require further refinement of the presented definitions.

What is new? A consensus based international terminology for endometriosis for clinical and research use.

Publication status:: Published

Peer review status:: Peer reviewed

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APA Style

of AAGL, I. W. G., ESGE, E. S. H. R. E., WES, C. T., Tomassetti, C., Johnson, N. P., Petrozza, J., Abrao, M. S., Einarsson, J. I., Horne, A. W., Lee, T. T. M., Missmer, S., Vermeulen, N., Grimbizis, G., Zondervan, K. T., & De Wilde, R. L. (2021). An International Terminology for Endometriosis, 2021. Facts, Views and Vision in ObGyn, 13(4), 295–304.

MLA Style

of AAGL, International Working Group, et al. “An International Terminology for Endometriosis, 2021.” Facts, Views and Vision in ObGyn, vol. 13, no. 4, European Society for Gynaecological Endoscopy, 2021, pp. 295–304.

Chicago Style

AAGL, International Working Group of, ESHRE ESGE, C. Tomassetti WES, C Tomassetti, NP Johnson, J Petrozza, MS Abrao, et al. 2021. “An International Terminology for Endometriosis, 2021.” Facts, Views and Vision in ObGyn 13 (4): 295–304.
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