A 52-year-old woman with a 6-week history of subacute cognitive decline, myoclonus, and fluctuating consciousness is evaluated. She has known Hashimoto thyroiditis on levothyroxine with TSH in target range. Her EEG is shown. The abnormality marked **B** — generalized rhythmic delta activity with diffuse slowing (FIRDA) — is most consistent with which diagnosis?
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