Malabsorption in the horse associated with alimentary lymphosarcoma

Area of Science:

• Veterinary Pathology
• Gastroenterology
• Oncology

Background:

• Malabsorption in horses can stem from various gastrointestinal pathologies.
• Alimentary lymphosarcoma is a neoplastic condition affecting the equine digestive tract.

Observation:

• Three horses presented with malabsorption and were diagnosed with alimentary lymphosarcoma.
• The tumors predominantly affected the small intestine and associated lymph nodes.
• Diffuse cellular infiltration led to significant villous atrophy and reduced mucosal surface area.

Findings:

• Reduced disaccharidase activity correlated with impaired digestive-absorptive processes.
• One horse showed paradoxical weight loss despite a normal appetite and absence of diarrhea, suggesting altered energy metabolism.
• Morphological features, including a high plasma cell infiltrate, resembled human alpha chain disease.

Implications:

• This study elucidates the pathological mechanisms of malabsorption in equine alimentary lymphosarcoma.
• Findings suggest potential parallels with human immunodeficiency disorders, warranting further investigation.
• Understanding these mechanisms can inform diagnostic and therapeutic strategies for affected horses.