Bethesda classification system for thyroid fine needle aspirates

Last revised by Dr Matt A. Morgan on 23 Jun 2021

Bethesda classification system for thyroid fine needle aspirates comprises six categories of pathological reporting of thyroid FNA, with each category linked to a malignancy risk. The categories are:

  • category I: non diagnostic
  • category II: benign
  • category III: atypia of undetermined significance
  • category IV: suspicious for follicular neoplasm
  • category V: suspicious for malignancy
  • category VI: malignant

See also

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