It is doubtful whether chondroma of the intervertebral disk, as originally described by Stookey,1is as rare as a review of the literature would indicate. The first reference to this condition to be found in the literature is by Adson,2who briefly mentioned one case with involvement of the cervical region; but the first detailed study was published in 1928 by Stookey, who reported seven cases, all arising in the cervical region. A year later von Pechy3reported one arising in the thoracic region, thus making a total of nine cases. Inquiry of Dr. A. W. Adson4reveals that he has since then seen at least three other cases, probably more. One of these arose in the thoracic region and one involved the cauda equina. Dr. Max M. Peet5informs me that he has had "at least three cases" of this type, one each in