Question
The histochemical staining technique marked by a “red arrow” represented in the photomicrograph below uses which of the following stains?
A. Congo red.
B. Crystal violet.
C. Methyl violet.
D. All of the above.
Show Answer
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Correct Answer » A
Explanation
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Congo Red positivityas shown by a red arrow in the photomicrograph above is the most reliable staining in diagnosing amyloid deposition.
When stained with Congo Red, the sections show a typical applegreen birefringence under polarized light. Loss of Congo Red staining caused by pretreatment of the tissue
with potassium permanganate is a useful tool for the diagnosis of amyloidosis AA.
