474 CASE AND RESEARCH LETTERS Turret Exostosis or Acquired Osteochondroma Exostosis de Turret: osteocondroma adquirido To the Editor:

Turret exostosis, otherwise known as acquired osteochon-droma, is a rare bone disorder originally described by Wissinger et al1 in 1966 as a smooth, dome-shaped, extra-cortical mass arising from the dorsum of the middle or proximal phalanges of the fingers; it has, however, also been described in other parts of the body. It is believed to be the result of a reactive process in the bone, triggered by injury, which eventually leads to areas of mature bone formation.2 Although Turret exostosis originates in the bone, it can man-ifest as a subcutaneous nodule. There are few reports of these nodules in the literature and none in dermatology journals. We describe the case of a 56-year-old woman, with no relevant past history, who consulted her dermatologist due to a nodular lesion that had been progressively growing o