What is a bone island?

What is a bone island?

A bone island (enostosis) is a noncancerous (benign) lesion that rarely causes symptoms. It’s a tiny, dense piece of bone that grew within another section of your bone — specifically, a piece of compact (cortical) bone within cancellous bone (a network of spongy bone tissue). The bone is isolated, like it’s on an island. The compact bone doesn’t damage the cancellous bone and doesn’t usually cause pain.