Lymphoma Classification in Goats.
Authors: Kiser Patti K, Löhr Christiane V
Journal: Veterinary pathology
Summary
# Lymphoma in Goats: A Pathological Classification Study Lymphoma has been documented sporadically in goats but lacked systematic characterisation until Kiser and Löhr examined 15 caprine cases (6 biopsies, 9 postmortem submissions) using WHO classification criteria with immunohistochemical phenotyping and morphological assessment. The cohort, predominantly young adult dwarf breeds with balanced sex representation, revealed a striking predominance of T-cell lymphoma (73%) over B-cell lymphoma (27%)—notably different from the pattern seen in dogs and horses—with further subdivision into lymphoblastic (27%), large granular lymphocyte (9%), diffuse small lymphocytic (27%), and peripheral/mature T-cell lymphomas (36%, mostly high-grade). T-cell cases showed a distinctive predilection for thoracic and cervical involvement suggestive of thymic origin, whilst B-cell lymphomas divided equally between diffuse large B-cell and intermediate B-cell lymphocytic subtypes. For equine practitioners, these findings underscore species-specific tumour behaviour; whilst lymphomas in horses more commonly present as B-cell neoplasms, the goat data suggests T-cell lineage predominance and mediastinal involvement may be characteristic of caprine disease, influencing diagnostic approach and prognostic counselling in affected animals.
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Practical Takeaways
- •Young dwarf goats presenting with mediastinal or cervical lymphadenopathy should raise suspicion for T-cell lymphoma as a primary differential diagnosis
- •Immunohistochemical classification of caprine lymphomas is essential, as T-cell predominance in goats differs markedly from other domestic species and may influence prognosis and management decisions
- •Histopathological examination with immunophenotyping using CD3 and CD79α markers enables accurate subtyping and prognostic stratification, particularly distinguishing high-grade from intermediate-grade peripheral T-cell lymphomas
Key Findings
- •T-cell lymphoma was predominant in goats (73% of cases) compared to B-cell lymphoma (27%), contrasting with dogs and horses where B-cell types are more common
- •Median age of affected goats was 3 years, predominantly young adults of dwarf breeds (Pygmy and Pygora)
- •T-cell lymphomas frequently involved the thoracic cavity and/or neck, suggesting thymic origin or homing patterns
- •Multicentric distribution was the most common topographic pattern, with T-cell lymphomas further subclassified into lymphoblastic (27%), large granular lymphocyte (9%), diffuse small lymphocytic (27%), and peripheral/mature T-cell types (36%)