Partial cortico-hippocampectomy in cats, as therapy for refractory temporal epilepsy: A descriptive cadaveric study

Area of Science:

• Veterinary Neurology
• Neurosurgery
• Epileptology

Background:

• Feline hippocampal sclerosis (HS) can lead to antiepileptic drug (AED)-resistant epilepsy, mirroring human conditions.
• Temporal lobe epilepsy (TLE) in humans is often treated with temporal lobe resection, yielding high seizure-free rates.
• Refractory epilepsy in cats presents a significant clinical challenge due to limited treatment options.

Purpose of the Study:

• To establish a surgical technique for hippocampal resection in cats as a treatment for AED-resistant seizures.
• To assess the feasibility and safety of a novel partial temporal cortico-hippocampectomy procedure in feline cadavers.

Main Methods:

• Prospective cadaveric study involving ten cats with varying head morphologies.
• Pre-surgical MRI and CT scans for 3D reconstruction of the brain and hippocampus.
• Histopathological examination of resected specimens and surrounding brain tissue; micro-CT for vascular assessment.

Main Results:

• Successful resection of the temporal cortex and hippocampus was achieved in nine out of ten cats.
• Histopathology revealed no significant traumatic or vascular lesions in most cases; one cat showed minor thalamic damage.
• All key hippocampal structures, including the dentate gyrus, were identifiable in histological samples.

Conclusions:

• A partial temporal cortico-hippocampectomy is a feasible surgical approach for feline epilepsy.
• This technique offers a potential therapeutic option for cats with medically intractable temporal lobe epilepsy.
• Further research is warranted to evaluate the clinical efficacy and long-term outcomes of this procedure.