The 2024 Update to the McDonald Criteria for Multiple Sclerosis Diagnosis: A Guide for Radiologists

Area of Science:

• Neurology
• Radiology
• Immunology

Background:

• Multiple sclerosis (MS) is a chronic CNS inflammatory demyelinating disease.
• The McDonald criteria are essential for timely and accurate MS diagnosis.
• Previous criteria required updates to reflect advancements in diagnostic tools.

Purpose of the Study:

• To review the 2024 updates to the McDonald criteria for diagnosing multiple sclerosis.
• To highlight imaging and clinical implications of the revised criteria.
• To provide practical guidance for radiologists in applying the updated McDonald criteria.

Main Methods:

• Review of the 2024 McDonald criteria updates.
• Focus on changes related to topographic sites, CSF biomarkers, and MRI markers.
• Integration of clinical context, including age, vascular risk factors, and pediatric cases.

Main Results:

• The 2024 criteria incorporate the optic nerve as a topographic site and an additional CSF biomarker.
• New optional MRI markers (central vein sign, paramagnetic rim lesion) are included.
• Stricter diagnostic thresholds are introduced for specific patient populations to prevent misdiagnosis.

Conclusions:

• The 2024 McDonald criteria offer refined diagnostic pathways for multiple sclerosis.
• Radiologists play a crucial role in applying these updated criteria, utilizing new imaging markers.
• These revisions aim to enhance diagnostic accuracy and optimize patient management in clinical practice.