Bethesda System · Pathology

Which thyroid Bethesda category is described as 'Atypia of undetermined significance'?

  1. Category I
  2. Category II
  3. Category III
  4. Category IV
Show answer and explanation

Correct answer: Category III

Category III represents atypia of undetermined significance (AUS) or follicular lesion of undetermined significance (FLUS). It has an intermediate risk of malignancy.

Difficulty: Medium Question 9 of 20

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