Generalised granulomatous disease in a horse.

The research study involves a 6-year-old horse that was diagnosed with generalized granulomatous disease, an uncommon systemic disorder characterized by chronic inflammatory nodules after showing various symptoms such as recurrent fever, weight loss, appetite loss, depression, thrombophlebitis, and multiple skin lesions. Despite initial positive response to antibiotic therapy for the diagnosed chronic respiratory disease, the horse was later euthanized due to worsening symptoms and final diagnosis of generalized granulomatous disease confirmed via necropsy examination.

Chronic Respiratory Disease Diagnosis and Initial Treatment

• The horse in question was observed over a period of three months, where it exhibited recurrent fever, loss of appetite, lethargy, and weight loss.
• The clinical examination revealed that the horse was in a depressed state, thin, and had thrombophlebitis and skin nodules, primarily on the scrotal skin.
• It was also suffering from leukocytosis, hyperfibrinogenaemia, and hyperglobulinaemia. Through an ultrasonographic examination of the horse’s thorax, areas of lung consolidation and pleural fluid were discovered which flagged initial concerns regarding chronic respiratory disease.
• An initial diagnosis of chronic respiratory disease was made based on the symptoms and the horse responded to antibiotic therapy.

Progression to Generalized Granulomatous Disease

• However, the horse was presented again three months later, showing continued weight loss, recurrent fever, and development of multifocal skin lesions. The skin lesions manifested as scales, crusts, and nodules on various areas of the horse’s body.
• Through histological evaluation of the skin biopsies, a granulomatous reaction was highlighted, indicative of the potential presence of generalized granulomatous disease.
• Further ultrasonography of the thorax showed multiple hypoechoic lesions, consistent with granulomas, in both lungs. This led to the final diagnosis of generalized granulomatous disease.

Euthanasia and Post-mortem Analysis

• Due to the severity of the disease and the poor prognosis, the owner of the horse opted for euthanasia.
• Upon post-mortem examination through necropsy, the main findings consolidated the diagnosis of generalized granulomatous disease. Multiple nodules of fibrotic granulomatous inflammation were found in the lung, heart, liver, gastrointestinal tract and mesenteric lymph nodes.