Cervix - cytology
Atypia / premalignant / preinvasive lesions
Atypical squamous cells of undetermined significance (ASC)



Topic Completed: 1 June 2011

Revised: 27 December 2018, last major update June 2011

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PubMed search: cervix Atypical squamous cells of undetermined significance (ASC)


Marilin Rosa, M.D.
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Cite this page: Rosa M. Atypical squamous cells of undetermined significance (ASC). PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/cervixcytologyatypicalsquamouscells.html. Accessed August 26th, 2019.
Definition / general
  • May be neoplastic (HPV related, LSIL, HSIL) or reactive
Terminology
  • Formerly called ASCUS
  • ASC is subdivided into atypical squamous cells of undetermined significance (ASC-US) and atypical squamous cells, cannot rule out a high grade lesion (ASC-H)
Clinical features
Treatment
  • Repeat cytology, colposcopy, or perform DNA testing for high risk HPV subtypes according to age group or previous history of dysplasia
Cytology description
  • Nuclear changes are more marked than reactive, less than LSIL
  • Nucleus is 2.5 - 3× size of intermediate cell nucleus or 1.5× size of mature metaplastic cell nucleus
  • In perimenopausal women (40 - 55 years), cells with bland nuclear enlargement (2 - 3× size of intermediate cell nuclei), smooth nuclear membranes and fine chromatin are likely to be negative for SIL / malignancy (Am J Clin Pathol 2005;124:58)
Cytology images

Images hosted on other servers:

Various images

Untypical Cytologic changes

ASC-H

Degenerative atypical cells

Additional references
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