What best describes the appearance of a Traumatic Bone Cyst?

The appearance of a Traumatic Bone Cyst is best characterized by its radiolucent nature, which often presents scalloping around the roots of adjacent teeth. This distinctive scalloping feature is a key diagnostic criterion for identifying a Traumatic Bone Cyst on radiographic images. The scalloped margins are typically seen as a result of the cyst's slow, expansive growth, which tends to form along the contours of existing bone structures.

In contrast to other options, such as radiolucencies that disappear over time, Traumatic Bone Cysts remain relatively stable unless they are surgically treated. Radiopacity at crown margins and dense radiopaque lesions do not apply as they describe different pathological conditions entirely, which do not align with the characteristics of a Traumatic Bone Cyst. Therefore, the best description of a Traumatic Bone Cyst is indeed the radiolucency that scallops around the roots of teeth.