Seizure recurrence in temporal lobe epilepsy.

Area of Science:

• Neurology
• Endocrinology
• Oncology

Background:

• Temporal lobe epilepsy (TLE) is a common focal epilepsy characterized by seizures originating in the temporal lobe.
• Initial management of TLE typically involves antiepileptic drugs (AEDs) to control seizure frequency and severity.

Observation:

• A patient presenting with clinical, electroencephalographic, and radiological findings consistent with TLE showed initial response to AEDs.
• Five years post-onset, the patient developed recurrent, prolonged episodes of confusion, initially attributed to refractory TLE.
• These confusional episodes were later found to be associated with intermittent hypoglycemia.

Findings:

• Extensive investigations ultimately led to the diagnosis of a metastatic insulinoma as the underlying cause of the patient's symptoms.
• Insulinoma, a rare tumor producing excess insulin, can manifest with neurological symptoms due to hypoglycemia.

Implications:

• This case underscores the critical need for comprehensive diagnostic evaluation in patients with epilepsy, especially when symptoms evolve or treatment fails.
• It emphasizes that neurological presentations can sometimes mask or mimic other systemic conditions, such as endocrine disorders.
• Clinicians should maintain a broad differential diagnosis, including rare neoplastic and endocrine causes, to avoid misdiagnosis and ensure appropriate patient management.