Ice crystal artifacts occur when tissue is frozen slowly.

• A. Ice crystal artifacts occur when tissue is frozen slowly.
• B. Ice crystals form during staining.
• C. Ice crystals never form.
• D. Ice artifacts occur only with dehydration.

Answer: (A)

Ice crystal artifacts are tied to the freezing process. When tissue is frozen slowly, water within and between cells has time to migrate and form large ice crystals. These large crystals mechanically disrupt cell membranes and the surrounding matrix, causing gaps, tears, and distorted structures seen as artifacts. In contrast, rapid or flash freezing creates many tiny crystals or vitreous (glass-like) ice, which causes far less damage and better preserves morphology. That’s why the statement is best: ice crystal artifacts occur when tissue is frozen slowly.

Staining itself isn’t where ice crystals form, so saying they form during staining isn’t correct. Ice crystals can form, they’re not nonexistent. And dehydration artifacts arise from chemical dehydration during processing, not from the physical freezing that creates ice crystals.