Anti-Shrinkage Technique for Feline Skin Samples

Area of Science:

• Veterinary Pathology
• Surgical Oncology
• Histotechnology

Background:

• Accurate surgical margin assessment is vital for preventing neoplasm recurrence and guiding treatment.
• Tissue shrinkage during histopathological processing leads to discrepancies between surgical and pathological evaluations.
• This discrepancy can compromise therapeutic decisions and patient prognoses.

Purpose of the Study:

• To quantify tissue shrinkage in feline skin specimens after formalin fixation.
• To evaluate a novel technique for minimizing shrinkage during tissue processing.
• To improve the reliability of surgical margin assessment in veterinary oncology.

Main Methods:

• Ten feline cadavers were used, with specimens collected from the thorax, flank, and femur.
• Measurements were taken at excision (T0), 10 minutes post-excision (T1), and after 48-hour formalin fixation (T2).
• A study group of specimens was stretched and pinned to a cork plate to maintain dimensions during fixation, while a control group was processed conventionally.

Main Results:

• Control specimens exhibited significant shrinkage (approx. 26% reduction in diameter) after 48 hours of formalin fixation.
• Specimens processed with the stretching and pinning technique showed minimal shrinkage (approx. 0.28% radius reduction, no diameter change).
• The technique effectively restored and maintained original tissue dimensions throughout the fixation process.

Conclusions:

• Feline skin specimens undergo substantial shrinkage (approximately 25%) during standard formalin fixation.
• The described stretching and pinning method is a practical and effective approach to mitigate tissue shrinkage.
• This technique offers a valuable tool for enhancing the accuracy of surgical margin evaluation in veterinary surgical pathology.