Lymphomatosis as a Cause of Abdominal Pain and Distension in Two Adult Horses.

This research study focuses on the rare occurrence of lymphoma causing severe abdominal discomfort in two adult horses, leading to their euthanasia. The study further explores lymphoma’s unique presentation in equine patients as peritoneal lymphomatosis with ascites through post-mortem examination.

Clinical Presentation and Diagnosis

• The research article begins with the presentation of two equine patients exhibiting severe abdominal distension, colic, lethargy, and decreased appetite. Because these symptoms often indicate severe stomach pain and distension, it was clear the horses required immediate medical attention.
• The team of researchers performed cytological analysis on the peritoneal fluid from each horse, facilitating an ante-mortem, or before death, diagnosis of lymphoma. Lymphoma is a type of cancer that begins in cells of the body’s immune system, specifically the lymphatic system.

Prognosis and Euthanasia

• Due to a poor prognosis for lymphoma in horses, which typically includes abdominal discomfort, weight loss, and difficulty in eating, the decision was made to humanely euthanize these patients to mitigate further suffering.

Post-Mortem Examination

• Post-mortem examination involved detailed histology and immunohistochemistry methods, serving to confirm the ante-mortem diagnosis of lymphoma. In the first case, the alimentary B-cell lymphoma was diagnosed, affecting the horse’s distal jejunum and cecum. For the second horse, T-cell lymphoma of the cecum was found.
• Both cases exhibited extensive metastasis—with the peritoneal and pleural serosae covered in small nodules and plaque-like masses consistent with a condition known as lymphomatosis. Lymphomatosis is the systemic spread of lymphoma, characterised by numerous tumours throughout the body.

Conclusion

• In conclusion, this study provides a detailed record of lymphoma’s uncommon manifestation in equine patients, presenting as peritoneal lymphomatosis with ascites—an abnormal build-up of fluid in the abdomen. Identifying and understanding rare disease presentations like this have significant implications in veterinary medicine, improving diagnostic proficiency and awareness of severity in such cases.