Periosteal Chondromas are rare, benign, chondrogenic tumors that occur on the surface of long bones, most commonly the proximal humerus.
Patients typically present between the ages of 10 and 20 years of age with regional pain secondary to irritation of overlying tendons. Diagnosis is made with radiographs showing a well-demarcated, shallow cortical defect with saucerization of the underlying bone.
Treatment is usually observation. Marginal surgical excision of the lesion, including the underlying cortex, is indicated in patients with severe and progressive pain.