Chondrosarcomas in Dogs and Cats
📝 Summary
Chondrosarcoma is a malignant cartilage tumor, the second most common bone cancer, favoring flat bones like ribs, nasal bones, and pelvis and seen more in German Shepherds. Surgery is the treatment with a guarded prognosis, plus follow-up anti-cancer medication.
1 Symptoms
Dogs are affected from 1 to 12 years (average 6) and cats 2 to 15 (average 9), with no sex preference. It occurs as primary or secondary forms, mostly in flat bones such as ribs, nasal bones, and pelvis, and sometimes the lumbar spine.
Signs depend on the bone involved: nasal chondrosarcoma causes sneezing and one- or two-sided bloody discharge, and once the nasal bone is destroyed, blockage. Rib tumors cause milder signs but can push into the chest and collapse a lung. X-rays look much like osteosarcoma.
2 Causes and Transmission
Chondrosarcoma is not contagious. It is a malignant tumor formed directly from cartilage cells, more common in German Shepherds and occasionally in cats.
No infectious cause is known; breed and cartilage location are the main associations.
3 Diagnosis
A veterinarian uses X-rays and a biopsy to confirm chondrosarcoma and distinguish it from osteosarcoma and other bone lesions.
Imaging of the chest and nearby bones checks for spread before planning surgery.
4 Treatment
The tumor is removed surgically, but the prognosis is guarded. Follow-up anti-cancer medication may be used to slow continued growth.
Regular re-checks monitor for regrowth or new lesions.
5 Prevention
There is no specific prevention. Awareness in at-risk breeds and early imaging of bone swellings or nasal signs help catch the tumor sooner.
Prompt evaluation of persistent sneezing with bloody discharge or new rib/pelvis masses supports earlier treatment.
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