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Osteosarcoma at the Site of a Triple Pelvic Osteotomy in a Dog

From the Departments of Veterinary Clinical Sciences (Rose, Novo) and Veterinary Population Medicine (Olson), College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota 55108.

An osteosarcoma (OSA) involving the right pelvis was diagnosed in a 12-year-old golden retriever 11 years after triple pelvic osteotomy (TPO) surgery. The dog was presented with a 12-week history of nonweight-bearing lameness of the right hind limb. Radiographs demonstrated an aggressive bone lesion of the right ilium with profound periosteal proliferation and punctate lysis that extended along the ilium caudally and into the right ischium, with its epicenter at the level of the right TPO plate. Necropsy revealed that the entire right hemipelvis, especially the ischium, was markedly thickened and firm with irregular margins. Histopathology was consistent with a diagnosis of OSA.