A plaque of bone, from which arises a hemispherical white nodule, approximately 1 cm. in
maximum diameter. The stalk of the lesion is somewhat thinner than the head.
This young man presented at the age of 18 with a painful lump on the left leg; there had
been pain for several weeks. Examination and X-ray showed the presence of an exostosis, which
was removed. The histology of the lesion was that of a cartilage-capped exostosis.