Rare canine aortic chondrosarcoma diagnosed by transarterial biopsy

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A new case report in the Journal of Small Animal Practice describes what appears to be an unusually rare diagnosis and treatment pathway for a canine great-vessel tumor: a 2-year-old Flat Coated Retriever with an incidentally detected intraluminal aortic mass that was ultimately diagnosed as chondrosarcoma using a transarterial biopsy approach. The mass enlarged on repeat CT, was sampled through right femoral artery catheterization with endoscopic biopsy forceps, and then treated with stereotactic body radiation therapy (SBRT) at 8 Gy in three every-other-day fractions, for a total dose of 24 Gy. Follow-up CT at five months showed stable disease, with no reported adverse effects from the biopsy or SBRT, but progression was documented eight months after treatment; the same SBRT protocol was repeated, and the dog was later euthanized after developing multiple organ dysfunction syndrome 84 days later. (synapsesocial.com)

Why it matters: For veterinary professionals, the report highlights two practical points: first, that definitive diagnosis of a high-risk intraluminal aortic lesion may be possible through a minimally invasive transarterial technique, and second, that SBRT may offer at least temporary local control in cases where surgery is not feasible. Primary tumors of the great vessels are rare in dogs, and prior literature suggests canine aortic chondrosarcoma has only been reported in a small number of cases, making this case notable for both its diagnostic method and its use of repeat SBRT in a vascular sarcoma setting. (pmc.ncbi.nlm.nih.gov)

What to watch: Watch for whether additional case reports or small series help define when transarterial biopsy and SBRT are appropriate for rare canine aortic tumors, and what durability of control clinicians can realistically expect. (synapsesocial.com)