Lafora's-like disease in a fennec fox (Vulpes zerda)

Area of Science:

• Veterinary Neurology
• Comparative Pathology
• Rare Genetic Diseases

Background:

• Fennec foxes (Vulpes zerda) are small desert canids.
• Neurological disorders can significantly impact animal health and welfare.
• Understanding rare diseases in exotic species is crucial for conservation and veterinary care.

Observation:

• A 6-year-old captive fennec fox presented with intractable seizures.
• Despite treatment with diazepam and phenobarbital, seizures progressed, leading to neurological deficits and death within six months.
• Necropsy revealed no gross brain lesions, but histological examination showed characteristic inclusions.

Findings:

• Histopathology identified amphophilic, PAS-positive, diastase-resistant inclusions in the brain, heart, and liver.
• Ultrastructural analysis revealed these inclusions were non-membrane bound, fibrillary to granular, and electron-dense.
• The clinical, histological, and ultrastructural findings were consistent with Lafora's disease, a human neurometabolic disorder.

Implications:

• This case represents the first documented instance of Lafora-like disease in a fennec fox.
• The findings expand the known species affected by this rare, fatal neurometabolic disorder.
• This research highlights the importance of considering genetic neurometabolic diseases in the differential diagnosis of seizures in exotic canids.