Avascular necrosis, ischemic osteonecrosis, of condyle (47 y/o female). Mottle radiolucency of most of the mandibular condyle is seen to have scalloped posterior and inferior borders.  There is a small oval subcortical area near the posterior margin, about midpoint between the top and bottom lesional margins, which shows increased radiolucency.  Superimposed anatomic structures make this difficult to interpret.