Do Gomori reticulin and PASM prefer Zenker fixation?

• A. Yes
• B. No
• C. Only Gomori reticulin
• D. Only PASM

Answer: (B)

Zenker fixation tends to interfere with staining methods that rely on silver impregnation or carbohydrate detection. Gomori reticulin visualization uses silver to highlight reticular fibers, and the mercuric chloride in Zenker can cause masking, background staining, or poor silver impregnation, making the reticular network harder to see. PASM depends on oxidation of carbohydrates to produce the characteristic magenta color, and mercury-based fixatives can alter or mask these carbohydrate groups, reducing the reaction. For these reasons, Zenker is not the preferred fixative; Bouin’s or formalin-based fixation is typically used to preserve the tissue in a way that supports these stains.