Case Sharing: Stepping Away from the Shadow of Splenectomy and Referral – The Diagnostic Turning Point for Chronic Anemia and Thrombocytopenia
Author: Dr. Ryan Chuang
In clinical practice, we often encounter complex cases that have spanned years. Today’s case, Momo, is a classic example—an 11-year-old dog with a history of Babesia (tick fever), long-standing anemia and thrombocytopenia (low platelet count), and a case that once faced recommendations for a splenectomy and specialty referral.
Through this case, I want to share the reality of clinical diagnostics—its challenges and turning points—and how we strike the safest balance between therapeutic risk and finding the root cause.
A Tricky Background: Chronic Anemia, Thrombocytopenia, and Splenomegaly
Momo’s historical medical records (from previous visits to the SPCA) revealed long-term, recurrent mild thrombocytopenia and anemia. Several years ago, Momo had also tested positive for Babesia gibsoni.
Over time, Momo’s anemia and platelet numbers gradually worsened, and diagnostic imaging revealed marked splenomegaly (an enlarged spleen). At that point, the primary considerations were:
Suspected recurrence of Babesia or a splenic tumor, leading to a recommendation for splenectomy.
The owner considering a referral to a specialty center for imaging or endocrinology to undergo more invasive diagnostics (such as bone marrow aspiration or splenic fine-needle aspiration).
However, despite these abnormal lab values, Momo remained in surprisingly good spirits with a healthy appetite. Faced with a chronic, complex case where "laboratory data and clinical signs don't fully align," how should we proceed?
The Crucial First Step: Careful Exclusion, Never Blind Treatment
When immune-mediated diseases (such as IMHA or IMTP) are suspected, standard treatment typically involves corticosteroids to suppress the immune system. However, for a dog with a history of Babesia infection, this presents a major dilemma:
If latent Babesia parasites are still lurking in the body, initiating steroid treatment could suppress the immune system, trigger a flare-up of the infection, and lead to fatal consequences.
Therefore, before considering any immunosuppressive therapy, I had to rule out Babesia recurrence using the highest standards:
Because Babesia PCR testing is relatively expensive and carries risks of false positives or false negatives, after discussing with the owner, we decided to first attempt targeted treatment for Babesia. Although the anemia improved slightly after two weeks of treatment, continuing treatment for another 10 days saw both the anemia and thrombocytopenia worsen again. This raised my suspicion that Momo’s underlying cause was not simply a blood parasite.
After further detailed discussion with the owner, I decided to proceed with the next step of cautious exploration.
Trial Treatment Under Close Monitoring
Diagnosing immune-mediated conditions sometimes relies on response to treatment, but this is by no means "leaving things to chance."
After administering an appropriate dose of corticosteroids alongside supportive care, the owner was instructed to closely monitor Momo's condition. Any signs of discomfort required immediate reporting and cessation of treatment. After two weeks on the appropriate steroid dose, Momo's platelet count returned to normal, and the anemia improved significantly.By week six of treatment, the anemia had fully resolved.
Diagnostic Conclusion: Resolving Evans Syndrome
Through careful management and medication adjustments over this period, Momo’s anemia and low platelet counts were completely brought under control. Currently, Momo is undergoing a gradual drug taper and has entered a stable monitoring phase.
Looking back, Momo presented a classic case of Evans Syndrome (concurrent Immune-Mediated Hemolytic Anemia and Immune-Mediated Thrombocytopenia). Following six months of progressive monitoring and dose reduction, Momo has fully recovered and no longer requires any medication.
A Veterinarian’s Takeaway: Caution and Monitoring Are the Only Solution
I am sharing Momo’s story to convey two important concepts to pet owners:
Never jump to advanced medications blindly: Immunosuppressants and steroids are double-edged swords. Before carefully ruling out underlying infections (such as tick-borne blood diseases commonly seen in Hong Kong), they should never be used hastily.
Treatment requires a dialogue between "direction" and "data": Medicine is not gambling. Behind every treatment decision must be solid differential diagnostics, precise testing, and frequent monitoring during initial treatment to ensure we stay on the right path.
Treatment and Monitoring Duration: Treating Immune-Mediated Hemolytic Anemia (IMHA) or Immune-Mediated Thrombocytopenia (IMTP) usually requires at least 3 to 6 months of continuous monitoring and extremely careful medication dose tapering. Reducing the medication too quickly or stopping it abruptly can easily trigger a relapse, making the condition significantly more difficult to control.
Vaccination Guidelines: According to current veterinary medical consensus, pets with a history of immune-mediated diseases should avoid future vaccinations. This prevents unnecessary stimulation of the immune system,which could otherwise compromise their stability.
I have also previously published articles detailing Immune-Mediated Hemolytic Anemia and Thrombocytopenia. Feel free to check them out if you would like to learn more!
If your pet is currently struggling with chronic anemia, abnormal platelet counts, or feeling lost regarding referrals and surgery, please feel free to talk with us so we can tailor the safest, most suitable care plan for them.
(Article by Dr. Ryan Chuang. Reproduction without permission is prohibited; sharing with original attribution is welcomed.)
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