Use MRI findings in CJD, the epidemiology and course of sporadic CJD, and clinical features and progression in sporadic CJD to frame the working diagnosis and next step; let it determine what to check next and how closely to follow the patient. Make the epidemiology and course of sporadic CJD the checkpoint that determines whether you escalate testing, narrow the differential, or change treatment.

You typically see what's called cortical ribboning, which stems from neocortical neuronal loss; It presents as a rapidly progressive dementia paired with myoclonus and ataxia; Sporadic cases actually account for about eighty percent of all Creutzfeldt-Jakob disease cases; Onset usually occurs between the ages of fifty and seventy-five, and the disease course is aggressive, with an average survival duration of only about seven months; You also frequently see the pulvinar sign, which is a highly symmetric T-two or proton-density hyperintensity in the pulvinar nuclei of the thalamus