In which of the following conditions is a normal EEG expected?

• A. Anoxia
• B. Benign rolandic epilepsy
• C. Juvenile myoclonic epilepsy
• D. Multiple sclerosis

Answer: (D)

A normal EEG is expected in benign rolandic epilepsy, which is a childhood epilepsy that often resolves by adolescence. In this condition, typical EEG findings may be present only during seizures or while the child is symptomatic, but they often show normal EEG results when they are not experiencing seizures.

In contrast, anoxia, juvenile myoclonic epilepsy, and multiple sclerosis can show abnormal EEG findings. Anoxia, which is a lack of oxygen to the brain, typically results in diffuse slowing or other changes depending on the severity. Juvenile myoclonic epilepsy presents characteristic rhythmic spikes or polyspike wave discharges, especially in the morning. Multiple sclerosis can also lead to abnormal EEG findings, particularly if there are lesions affecting brain regions involved in electrical activity. Thus, benign rolandic epilepsy is the correct choice regarding the condition where a normal EEG is expected at times.