The moth eaten (osteolytic) appearance on this canine radiograph is most prominent on which bones of the forelimbs?

The moth eaten (osteolytic) appearance on this canine radiograph is most prominent on which bones of the forelimbs?

• A. Radius
• B. Ulna
• C. Carpal bones
• D. Metacarpals

Answer: (D)

Moth-eaten osteolysis represents aggressive destruction of cancellous bone and cortex, often from malignant or infectious processes. In the forelimb, these destructive changes tend to arise in metaphyseal cancellous bone where red marrow and rapid remodeling are greatest, which is most pronounced in the metacarpal bones. The radius and ulna have thicker cortices and diaphyseal areas that are less likely to show this pattern clearly, and the carpal bones are small and easily obscured by overlap, making lesions there less conspicuous. So, the metacarpals exhibit the most evident moth-eaten appearance.

Moth-eaten osteolysis represents aggressive destruction of cancellous bone and cortex, often from malignant or infectious processes. In the forelimb, these destructive changes tend to arise in metaphyseal cancellous bone where red marrow and rapid remodeling are greatest, which is most pronounced in the metacarpal bones. The radius and ulna have thicker cortices and diaphyseal areas that are less likely to show this pattern clearly, and the carpal bones are small and easily obscured by overlap, making lesions there less conspicuous. So, the metacarpals exhibit the most evident moth-eaten appearance.