This week’s case is a 2-year-old male neutered Golden Retriever with previous palliative radiation therapy for osteosarcoma. Describe your findings.
Findings
Left pelvic limb: There is profuse, irregular new bone formation and destruction of the distal tibia and fibula. There is new bone production cranial to the tarsus as well as caudal to the tarsus. There is a short, oblique, radiolucent line traversing the distal metaphysis and epiphysis of the tibia. Smooth periosteal reaction extends to the mid-diaphysis of the tibia with medullary sclerosis.Thorax: The cardiovascular structures are normal in size and shape. There is a small, opaque nodule superimposed over the second ribs on the left lateral projection and the right lateral projection. An ill-defined nodule is superimposed over the diaphragm on the right lateral projection. The remainder of the pulmonary parenchyma appears normal. There is increased soft tissue opacity dorsal to the second sternebra.
Diagnosis
- Pathologic fracture of the distal tibial osteosarcoma
- The dense appearance of the tumor is likely secondary to radiation therapy
- Pulmonary metastatic disease
- Sternal lymphadenopathy may be reactive or metastatic.