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  • Title: Parosteal osteosarcoma. 2-23-year follow-up of 33 patients.
    Author: Ritschl P, Wurnig C, Lechner G, Roessner A.
    Journal: Acta Orthop Scand; 1991 Jun; 62(3):195-200. PubMed ID: 2042459.
    Abstract:
    In a study of the working group for bone tumors of the German Orthopedic Society, 33 patients with a histologically confirmed parosteal osteosarcoma at reexamination underwent clinical and radiographic follow-up. Local recurrence occurred in all the cases after intralesional surgery and in 4 of 8 cases after marginal excision. The grade of differentiation was decisive for the prognosis. Despite intralesional surgery, the prognosis for Grade 1 tumors was good. Metastases developed in 1 of 23 patients with a Grade 1 tumor and in 4 of 9 patients with a Grade 2 tumor. The single patient with a Grade 3 tumor was treated with adjuvant chemotherapy and was free of disease after 5 years.
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