Granulomatous Inflammation · Pathology

Which stain is most useful for identifying acid-fast bacilli in granulomatous lesions?

  1. Gram stain
  2. Periodic acid–Schiff
  3. Ziehl–Neelsen stain
  4. Giemsa stain
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Correct answer: Ziehl–Neelsen stain

Ziehl–Neelsen stain detects acid-fast bacilli such as Mycobacterium tuberculosis. The organisms appear bright red against a blue background.

Difficulty: Medium Question 6 of 20

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