Which description describes a well-defined lesion with an internal radiolucent rim?

• A. Internal radiolucent/hypodense rim
• B. Punched-out
• C. Corticated (uniform)
• D. Sclerotic (non-uniform)

Answer: (A)

A well-defined lesion with an internal radiolucent rim is described by calling the inner boundary a radiolucent or hypodense rim. This means, on the radiograph, you can see a distinct dark ring inside the lesion—an internal boundary that is less dense than the surrounding lesion tissue. This pattern helps distinguish lesions that have an inner, lucent boundary from those that simply have an outer corticated border or a thick sclerotic edge. The term internal radiolucent/hypodense rim precisely captures that inside-ring appearance, which is what the description is pointing to.