Ischemic osteonecrosis, avascular necrosis (mandibular condyle, 49 y/o female). Darkly discolored superior portion of the condyle is honeycombed with small cystic spaces, often with denuded trabeculae (slight yellow/white color).  The posterior superior region was extremely mushy while the less darkly discolored inferior portion of the photo was relatively firm and microscopically showed only bone marrow edema.