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Terminology to report these findings has changed considerably to accommodate the changes in understanding of cervical neoplasia, and to accommodate new management strategies, tests, and technologies. This article reviews the evolution of terminology for equivocal Pap test findings from the original Papanicolaou classification to the current the Bethesda System 2001 atypical squamous cells terminology, the implication and use of these terms, and the changing landscape of cervical neoplasia screening, which prompted these terminology changes. Emerging issues related to improving risk stratification through the introduction of additional terms and the impact of human papillomavirus testing may alter terminology of equivocal findings in the future. Diagn. Cytopathol. 2010. \u00a9 2009 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/dc.21191","type":"journal-article","created":{"date-parts":[[2009,10,23]],"date-time":"2009-10-23T17:26:02Z","timestamp":1256318762000},"page":"221-232","source":"Crossref","is-referenced-by-count":8,"title":["Living with uncertainty: Equivocal Pap test results and the evolution of ASC terminology"],"prefix":"10.1002","volume":"38","author":[{"given":"Lydia Pleotis","family":"Howell","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maaya","family":"Wilton","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John","family":"Bishop","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alaa","family":"Afify","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2009,10,23]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9378(68)90187-7"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1001\/jama.222.6.691"},{"key":"e_1_2_1_4_2","first-page":"108","article-title":"Non\u2010diagnostic squamous atypia in cervico\u2010vaginal cytology as a risk factor for early neoplasia","volume":"20","author":"Melamed M","year":"1976","journal-title":"Acta Cytol"},{"key":"e_1_2_1_5_2","first-page":"42","volume-title":"Monographs in clinical cytology","author":"Patten SF","year":"1978"},{"key":"e_1_2_1_6_2","first-page":"56","article-title":"Experience with 40,000 Papanicolaou smears","volume":"48","author":"Sandmire HF","year":"1976","journal-title":"Obstet Gynecol"},{"key":"e_1_2_1_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0029-7844(98)00080-5"},{"key":"e_1_2_1_8_2","unstructured":"PapanicolaouGN.New cancer diagnosis. 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