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Scholars Journal of Applied Medical Sciences | Volume-8 | Issue-03
Parosteal Osteosarcoma with Focal Metaplasia: A Case Report
A. Krite, H. Abid, M. Elidrissi, A. ElIbrahimi, A. ElMrini
Published: March 6, 2020 | 81 45
It is the most common type of juxtacortical or surface osteosarcoma and accounts for 5% of all osteosarcomas. It typically presents in early adulthood and middle age with a peak incidence in the third decade. It affects females slightly more than males. Patients usually present with a painless, slowly enlarging mass. They are usually located at the metaphysis (80-90%), most commonly at the posterior aspect of the distal femur (60%), followed by either end of the tibia, and then the proximal humerus. Parosteal osteosarcomas are usually low-grade lesions are usually treated with surgical resection and no neoadjuvant chemotherapy or radiation. As they are frequently metaphyseal in location, large parosteal osteosarcomas or those with deep medullary invasion may require limb salvage, including joint replacement. Parosteal osteosarcomas have an excellent prognosis (80-95% long-term survival).