Actor Christina Applegate revealed this week that she had been misdiagnosed with multiple sclerosis five years after receiving the initial diagnosis. Her experience highlights the difficulty of diagnosing a complex disease early enough to prevent irreversible damage while maintaining accuracy.
Diagnostic challenges in neurology
Multiple sclerosis does not present the same way in every patient, and other neurological disorders can produce similar symptoms. Signs such as numbness, vision changes, fatigue, and difficulty walking occur in many conditions, and abnormalities detected on an MRI are not necessarily unique to MS.
The consequences of both misdiagnosis and delayed diagnosis can be substantial. Someone incorrectly diagnosed with MS may receive treatments they do not need, potentially exposing them to unnecessary risks while delaying appropriate care for the condition actually causing their symptoms.
For people whose MS goes undiagnosed, time matters enormously. While there is not yet a cure for MS, there are more than 20 therapies that can help reduce disease activity and slow worsening for many people living with MS. Research has demonstrated the importance of initiating appropriate treatment early in the course of disease, before neurological damage accumulates. Every unnecessary delay can mean a missed opportunity to protect long-term neurological health.
Evolution of diagnostic criteria
Advances in imaging, biomarkers, and diagnostic criteria have changed how MS is diagnosed. Decades of research have fundamentally changed what is possible, providing better diagnostic tools, more sophisticated imaging technologies, and a deeper understanding of MS than at any point in history.
One of the most significant developments has been the evolution of the McDonald Diagnostic Criteria, the internationally recognized guidelines physicians use to diagnose MS. Working in partnership with the European Committee for Treatment and Research in Multiple Sclerosis, the National Multiple Sclerosis Society helped advance these criteria, contributing to progress that has shortened the diagnostic process from years to months in many cases. The latest revisions incorporate new imaging techniques and biomarkers designed to improve both the speed and accuracy of diagnosis.
A particularly promising example is an MRI technique that identifies the central vein sign, a feature that can help physicians distinguish lesions associated with MS from abnormalities caused by other conditions. Alongside progress in spinal fluid biomarker research, this technology offers the potential for earlier, more accurate diagnoses.
Barriers to care
Even the most sophisticated diagnostic tools cannot improve outcomes if patients cannot access the specialists and health care systems equipped to use them. Access to neurological care across the country is uneven, and some communities face significant shortages of neurologists, particularly those with specialized expertise in MS.
