What is the role of EEG and MRI in the evaluation of seizure disorders?

• A. They identify the type of brain cancer.
• B. They evaluate the seizure disorder and locate the focal origin.
• C. They monitor blood sugar levels.
• D. They are optional and rarely used.

Answer: (B)

EEG and MRI provide complementary information that guides the evaluation and management of seizure disorders. EEG measures the brain’s electrical activity, catching interictal spikes, sharp waves, or ictal patterns that help determine whether seizures are focal or generalized, classify the seizure type, and monitor response to therapy. MRI gives a detailed map of brain anatomy, identifying structural causes such as malformations, sclerosis, tumors, vascular lesions, or scar tissue that could be the source of seizures.

Together, EEG helps localize the functional origin of seizures, while MRI pinpoints the precise brain region and any underlying lesion, which is crucial for decisions about treatment options, including surgical planning. They are standard parts of the evaluation, not optional, and they serve to both diagnose and guide prognosis and therapy.