1. 1. Baena-Ocampo Ldel C, Ramirez-Perez E, Linares-Gonzalez LM, et al. Epidemiology of bone tumors in Mexico city: retrospective clinicopathologic study of 566 patients at a referral institution. Ann Diagn Pathol 2009 Feb;13(1):16-21.
2. 2. Obalum DC, Eyesan SU, Ezembakwe ME, et al. Pattern of osteochondromas in Lagos, Nigeria. Nig Q J Hosp Med 2008;18:69-71.
3. 3. Kitsoulis P, Galani V, Stefanaki K, et al. Osteochondromas: review of the clinical, radiological and pathological features. In Vivo 2008;22:633-46.
4. 4. Unni KK, editor. Dahlin's Bone Tumors: General aspects and data on 11,087 cases. 5th ed. Philadelphia: Lippincott-Raven; 1996; p11-23.e clinical, radiological and pathological features. In Vivo 2008;22:633-46.
5. 5. Robson AK, Kissin MW, Eltringham WK. Chondrosarcoma arising in an osteochondroma: an unusual cause of an abdominal mass. Eur J Surg Oncol 1990;16:60-2.