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To the Editor:—
The report of a case by McNamara et al (205:535, 1968) of late pulmonary metastasis 17 years and 33 years after amputation for osteogenic sarcoma was interesting but perhaps should have some clarification. There is a special type of osteogenic sarcoma that is slow-growing and of low-grade malignancy, which is more common in females, and the most frequent site is the lower end of the femur, presenting posteriorly as an extraosseous mass. This was described by Geschickter and Copeland (Ann Surg133:790-806, 1951) as a new entity which they called parosteal osteoma. It is also known as parosteal sarcoma and juxtacortical osteogenic sarcoma. From the site of the primary tumor and the subsequent course of McNamara's patient, it seems reasonable to assume that what was in 1933 reported as osteogenic sarcoma would now be called parosteal sarcoma. The slow development and late appearance of the metastases
March HC. Parosteal Sarcoma. JAMA. 1968;206(4):895. doi:10.1001/jama.1968.03150040107031