In the image, what do the arrows and asterisks point to?

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Study for the ACVIM Small Animal Internal Medicine Exam to enhance your veterinary knowledge. Prepare with flashcards and multiple-choice questions, featuring hints and explanations. Ensure success in your exam journey!

Multiple Choice

In the image, what do the arrows and asterisks point to?

Explanation:
The arrows and asterisks point to bone forming along the inner surface of the cortex—the endosteal surface. This endosteal reactive bone is the bone’s response to irritation or a lesion within the medullary cavity or on the inner cortex, so you see new, often irregular or laminated bone lining the endosteum on imaging. That pattern distinguishes it from simple soft-tissue structures or normal cartilage, and from neoplastic cells which aren’t directly visible as a discrete radiographic feature. In short, the markings reflect the bone’s reparative reaction at the endosteal margin.

The arrows and asterisks point to bone forming along the inner surface of the cortex—the endosteal surface. This endosteal reactive bone is the bone’s response to irritation or a lesion within the medullary cavity or on the inner cortex, so you see new, often irregular or laminated bone lining the endosteum on imaging. That pattern distinguishes it from simple soft-tissue structures or normal cartilage, and from neoplastic cells which aren’t directly visible as a discrete radiographic feature. In short, the markings reflect the bone’s reparative reaction at the endosteal margin.

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