The silent, aggressive cancer that turns blood vessels into ticking bombs
In short: Hemangiosarcoma is a highly malignant cancer that originates in the cells lining our blood vessels. In dogs, it often remains hidden until a sudden, catastrophic rupture occurs. Because it spreads so rapidly, owners frequently discover the disease only at the moment of a life-threatening emergency.
Hemangiosarcoma (HSA) is a primary malignancy of the vascular endothelium—the cells that create and line blood vessels. While it can occur anywhere, it most commonly affects the spleen or heart in older, large-breed dogs, such as German Shepherds, Golden Retrievers, and Labrador Retrievers. Because it arises from the vascular system, the tumor is prone to spontaneous rupture, which can lead to rapid, internal bleeding (hemoabdomen) or fluid buildup around the heart (pericardial effusion).
The clinical presentation is often deceptive. Many dogs show only mild, non-specific signs like lethargy, exercise intolerance, or a decreased appetite. However, the most common reason for clinical intervention is a sudden episode of collapse, severe weakness, or rapid breathing caused by acute hemorrhage. In skin-based forms, the cancer may appear as bruising or 'blood blisters,' though these can also rupture and bleed externally.
The prognosis for visceral HSA is generally poor. For splenic HSA, less than 10 percent of dogs survive one year after diagnosis. Surgery alone is considered palliative, yielding an average survival time of only two months because the cancer aggressively recurs. Adding chemotherapy can increase the median survival time to four to six months. While there is no cure, these treatments aim to delay progression and maintain quality of life.
While common in dogs, HSA is rare in cats, accounting for less than 2 percent of their nonhematopoietic neoplasms. In felines, it can be triggered by factors like prolonged sunlight or chronic tissue trauma from ear infections. In dogs, while the exact cause is unknown, genetics play a significant role, and UV sunlight is thought to contribute specifically to the skin form of the disease.
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Sources
- Summary by Intellect · source: Hemangiosarcoma in dogs
- Also: Hemangiosarcoma
- Also: Case Report: Clinical and magnetic resonance imaging findings in intracranial hemangiosarcoma in a cat.
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