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Anatomic distribution of osteosarcoma in humans (A) and in dogs (B). Numbers indicate the percentage of cases at each anatomic site out of all osteosarcomas in adolescent humans (<24 years old; n = 1855) [1], and the mean percentage at each anatomic site compiled from five canine studies (n = 1346) [3,9,16,63,64]. Only the most common skeletal sites are included; therefore, percentages do not add up to 100%.
