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Hypernatremia in a Cat with Toxoplasma-Induced Panencephalitis
Christiane Weingart1, Achim D Gruber1, Mathias Brunnberg1
1From the Department of Veterinary Pathology (A.D.G.) and Clinic of Small Animals (C.W., M.B., B.K.), Freie Universität Berlin, Berlin, Germany.
A cat with neurological signs developed severe hypernatremia due to Toxoplasma-induced panencephalitis affecting the hypothalamus and pituitary gland, leading to diabetes insipidus and dehydration.
Area of Science:
- Veterinary Neurology
- Infectious Diseases
- Pathology
Background:
- Progressive neurological signs in cats can indicate serious intracranial disease.
- Hypernatremia in animals often suggests central nervous system dysfunction or dehydration.
Observation:
- A 12-year-old cat presented with dehydration, stupor, and anisocoria.
- Laboratory results showed severe hypernatremia, azotemia, hyperglobulinemia, and erythrocytosis.
- Imaging revealed structural loss in the cerebrum, hypothalamus, and pituitary gland.
Findings:
- Histopathology confirmed subacute granulomatous and necrotizing panencephalitis.
- Toxoplasma protozoa were identified as the causative agent.
- The inflammation led to hypothalamic and pituitary dysfunction, causing diabetes insipidus.
Implications:
- Toxoplasma encephalitis can cause severe neurological signs and metabolic derangements in cats.
- Diabetes insipidus, exacerbated by poor water intake, is a critical factor in hypernatremia.
- This case highlights the importance of considering infectious causes for central nervous system disease in felines.
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