What is a bone island?
A bone island, or enostosis, is a benign hamartoma that appears radiographically as an oval or round sclerotic focus that may have radiating bone spicules from the center of the lesion. Bone islands are typically asymptomatic, are incidentally discovered, and usually do not show increased radiotracer uptake on a nuclear medicine bone scan. Osteopoikilosis is a benign condition with multiple bone islands.