[Osteoid osteoma]

Reference is made to a case of osteoid osteoma of the humerus followed radiologically from the first symptoms to surgery, to complete cure and followed up 10 yr later, in an extensive account of the subject, its historical background, aetiology, sites, anatomopathological, clinical and radiological picture, differential diagnosis, prognosis and treatment. Support is given to the view that this is a benign, tumoral lesion.