Polycystic hepatic disease, thoracic granular cell tumor and secondary hypertrophic osteopathy in a horse.

The research is about a case of a 13-year-old American Saddlebred mare that displayed a combination of polycystic hepatic disease, thoracic granular cell tumor, and secondary hypertrophic osteopathy, which is an unusual and unreported issue in horses.

Case Presentation and Initial Diagnosis

• The research article starts with the presentation of the mare that had noticeable anorexia for four days straight. The physical examination of the mare revealed an increased effort during inspiration and an unnatural enlargement of the lower portion of her limbs.
• Upon conducting radiography, a thoracic mass was observed along with proliferations of the periosteum on the distal limbs. This was indicative of hypertrophic osteopathy, a disease characterized by excessive growth of bone in the limbs, and one that is typically associated secondary to another disease.

Further Examination and Observations

• The research team conducted a gastric endoscopy test which revealed that there were ulcerations at the lower part of the esophagus and in the stomach, and a functional stenosis, or narrowing, in the pyloric region of the stomach.
• Further, an abdominal ultrasonographic examination was conducted that revealed multiple large, cyst-like structures on the liver. A percutaneous biopsy of the thoracic mass confirmed it as a granular cell tumor, which is a rare and typically benign form of tumor.

Final Diagnosis and Conclusion

• Post-mortem analysis of the mare showed a large mass with interconnected cystic structures on the edge of the liver. The liver lesions were histologically analysed and found to be consistent with cystic hepatic disease, which is characterized by the formation of numerous cysts in the liver.
• This case of a hoofed animal presenting with a granular cell tumor, cystic hepatic disease, and secondary hypertrophic osteopathy was peculiar and had never been reported previously. The research emphasizes that it’s essential to enhance our pathogenic understanding of such instances to improve diagnostic and treatment modalities in equine health.