Which histological finding is most characteristic of amyloid deposition?
Correct answer: A. Apple-green birefringence after Congo red staining
- A. Apple-green birefringence after Congo red staining
- B. Magenta material with periodic acid Schiff stain only
- C. Black granules after Prussian blue staining
- D. Metachromatic material after Gram staining
Explanation
Amyloid deposits bind Congo red and show apple-green birefringence under polarized light, which is a characteristic diagnostic finding. Prussian blue staining is used mainly to demonstrate iron deposits such as hemosiderin.
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