Which term describes a radiolucent lesion with a scalloped border?

• A. Circular
• B. Scalloped
• C. Irregular
• D. Linear

Answer: (B)

Border morphology of radiolucent lesions on dental radiographs is what this item is about. A scalloped border describes an outer edge that has a series of gentle indentations, giving a wave-like, scalloped appearance that follows between adjacent tooth roots. This pattern happens when the lesion expands in the spaces between roots, so the border conforms to the interproximal bone rather than forming a smooth circle. Because it specifically captures that interdental, wavy edge, the term that best fits is scalloped. Other shapes describe different outlines: circular implies a round, smooth border; irregular means a jagged or uneven edge not tied to root anatomy; linear indicates a long, straight border.