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Bone Tumors in Dogs and Cats

By

Joseph Harari

, MS, DVM, DACVS, Veterinary Surgical Specialists, Spokane, WA

Last full review/revision Nov 2020 | Content last modified Nov 2020
Topic Resources

Skeletal tumors can be benign or malignant and primary or secondary to metastases or adjacent soft-tissue structures. The most common primary bone tumor is osteosarcoma that affects the distal radius, proximal humerus, distal femur, or proximal tibia.

Clinical signs include lameness, bone swelling, and an acute, nontraumatic pathologic fracture of the bone. Radiography reveals osteolysis, proliferation, and soft-tissue swelling; thoracic radiographs should be performed to delineate metastatic masses. Bone biopsy using a Michelle bone trephine or Jamshidi biopsy needle is imperative in confirming the diagnosis. Less frequently identified tumors include chondrosarcoma, fibrosarcoma, and hemangiosarcoma.

Treatment includes limb amputation and chemotherapy with carboplatin, cisplatin, or doxorubicin. Palliative care to reduce pain and discomfort can be provided with oral NSAIDs Nonsteroidal Anti-inflammatory Drugs The importance of pain management and the use of NSAIDs in animals has increased dramatically in recent decades, with use of NSAIDs in companion animals being routine. NSAIDs have the potential... read more Nonsteroidal Anti-inflammatory Drugs , opioids, transdermal patches, or radiation therapy. Prognosis is guarded. Untreated animals rarely live more than several months. Amputation and chemotherapy may double the survival times. Median survival times after amputation are 5 months in dogs and 4 years in cats. Advanced procedures such as limb sparing and excision of metastases can also (infrequently) be performed.

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Musculoskeletal Disorders in Large Animals
A seven-year-old Quarter horse gelding presents with a 1-week history of mild lameness. During the examination, the horse raises his head as he places weight on his left forelimb and drops it when placing weight on the right forelimb. Which limb is most likely affected in this horse?
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