By solitary benign enchondroma of bone we mean the benign cartilaginous growth which begins its development in the interior of an affected bone and involves only a single bone in any 1 subject. Our records include 28 instances1 of this type of lesion, and the discussion which follows is based largely on these. To judge from our experience, the lesion appears mainly in phalanges (particularly those of the hand), in metacarpal bones and in the humerus and femur, though other bones of the limbs are occasionally the site. Although our own cases do not include any in which the lesion was in a bone other than one of a limb, it should be noted that instances of such localization have also been reported.
A benign enchondroma may be present in the interior of a bone without causing any obvious distention. However, it is not unusual to find, especially if