Which statement is false about undecalcified bone processing?

• A. It must be embedded in carbowax.
• B. It does not require decalcification before embedding.
• C. It can be sectioned without decalcification.
• D. Carbowax is used for embedding undecalcified bone.

Answer: (B)

Undecalcified bone processing aims to keep the mineralized matrix intact so you can study bone structure and mineral content. Because mineralized bone is very hard, the embedding medium must infiltrate a calcified matrix without dissolving or removing those minerals. Carbowax (a polyethylene glycol–based embedding medium) and certain acrylic resins are commonly used because they can harden around the mineralized tissue, allowing thin sections to be cut with a microtome without decalcification. Decalcification, when used, is avoided or minimized to preserve mineral structure and prevent loss of information about the mineral phase.

So the statement claiming that undecalcified bone processing does not require any decalcification before embedding isn't universally true. While many workflows avoid decalcification, some protocols include a light decalcification step to improve infiltration or section quality with a particular embedding medium. That variability means this claim isn’t a universal rule, making it the false statement in certain contexts.

The other points align with common practice: embedding undecalcified bone in a hard medium like carbowax is a recognized approach, and you can section without decalcification when using proper embedding media and techniques. Carbowax is indeed associated with undecalcified bone embedding in standard protocols.