The problem shown could have been prevented by which action?

• A. Opening specimen, pinning it out, and adding fixative upon receipt
• B. Re-fixation in stronger fixative
• C. Extending dehydration steps
• D. Using smaller embedding molds

Answer: (A)

Prompt fixation of tissue on receipt is essential to prevent autolysis and to preserve morphology during processing. Opening the specimen allows fixative to reach the interior, pinning it out keeps the surface flat for even penetration, and adding fixative upon receipt ensures the tissue begins fixing right away. Together, these steps stop enzymatic degradation early and minimize artifacts caused by poor fixation, preserving architecture and staining quality.

Re-fixation in a stronger fixative wouldn’t undo damage that has already occurred from delayed or uneven fixation and can also lead to over-fixation, which can mask details or affect downstream staining. Extending dehydration steps addresses dehydration rather than fixation adequacy and can introduce additional artifacts like shrinkage. Using smaller embedding molds helps with orientation and block handling but does not fix the underlying issue of inadequate fixation upon receipt.