Primary appendicular hemangiosarcoma and telangiectatic osteosarcoma in 70 dogs: A Veterinary Society of Surgical Oncology retrospective study.

HSA should be considered as a differential in dogs with aggressive lytic bone lesions, particularly medium-sized dogs with tibial lesions. HSA has a unique clinical presentation but similar therapeutic response and outcome to OSA. Amputation and chemotherapy appear to prolong survival in some dogs with HSA and tOSA.