Abstract
1. Three cases of aneurysmal bone cyst are recorded. It is suggested that the condition is a type of cavernous haemangioma and the term haemangiomatous bone cyst is preferred.
2. A survey of the published cases suggests that in its early stages the lesion is amenable to local surgery, which is the treatment of choice, but for inaccessible lesions deep x-ray therapy may be effective.