CJD -Creutzfeldt-Jakob disease is a rare disease with a worldwide incidence of about 1 per million per year, a rapidly progressive, fatal prion disease presenting with dementia and myoclonus, without inflammation, distinguishing it from other neurological disorders.
What makes CJD interesting is how something without DNA or RNA can still behave like an infectious disease. The entire pathology is driven by protein misfolding [PrPˢᶜ (prion)], which then spreads in a chain reaction inside the brain.
Another striking point is the absence of inflammation.
Clinically, the most important clue is speed. Unlike other dementias, CJD progresses extremely fast—within weeks to months—and is often associated with myoclonus, which helps differentiate it.
Diagnosis/Investigations:
MRI brain → cortical ribboning
EEG → periodic sharp waves
CSF:14-3-3 protein RT-QuIC (highly specific)
Management & Prognosis:
No cure → only palliative care
Fatal within 6–12 months in most cases
Case Study:
A 64-year-old female initially presented with lower limb weakness and twitching, along with subtle memory issues. At this stage, the presentation was suggestive of Guillain-Barré Syndrome, and she was managed accordingly.
However, what stood out was the rapid deterioration within 1–2 days. She developed marked cognitive decline, behavioral changes, speech difficulty, and prominent myoclonus—features that are not typical for GBS.
The lack of response to IVIG further raised suspicion.
Repeat investigations changed the direction:
MRI showed cortical involvement
EEG revealed periodic sharp waves
At this point, a diagnosis of Creutzfeldt-Jakob Disease was considered and later confirmed with CSF RT-QuIC and 14-3-3 protein.
Takeaway:
• Re-evaluating the diagnosis when clinical progression is atypical
• In neurology, the speed of progression can be as important as the symptoms themselves.
Do you know about this disease??Have you observed neurological diseases that mimic other conditions during their early presentation?
MBH/PS