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[Diagnostic criteria of multiple sclerosis in neuroimaging]
1Service de Biophysique et Médecine Nucléaire, CHU Rangueil, 1, av. Jean Poulhès, 31403 Toulouse. berry.i@chu-toulouse.fr
Abstract:
Although sensitivity of MRI to MS is high, its specificity is limited and requires the use of criteria such as Paty's, Fazekas's and then Barkhof's, taking successively into account the technical progress and the use of contrast agents. In the later the confidence level brought by contrast enhancement is equivalent to that of 9 hyperintense lesions seen on T2-weighted imaging. Therefore MRI is now the first paraclinical test to perform for MS suspicion and is aimed at the diagnosis MS from the first clinical event, without need to wait for the second relapse for temporal dissemination confirmation. The goal is to be able to discuss early treatment if it becomes clear that it could prevent disease progression. The early evidence of spatial and temporal dissemination of the disease takes equally into account the clinical and MRI information and eliminates the previous terminology of "clinically defined MS". Presently the diagnosis is either confirmed or ruled out and in a limited number of cases or before the completion of the work up phase the category of "possible MS" is used. Although progress were also made in the field of prognosis evaluation of MS with MRI, it still brings less definitive information to predict individually the evolution of each form of the disease. This opens a large place for new techniques such as magnetisation transfer, spectroscopy and diffusion imaging which are already able to help pathophysiological understanding and which may play an increased role even at the individual level in the future.
Insights
Magnetic Resonance Imaging (MRI) is crucial for diagnosing Multiple Sclerosis (MS) early, even from the first clinical event. Advanced MRI techniques are being explored for better prognosis and understanding of MS progression.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Context:
- Multiple Sclerosis (MS) diagnosis relies heavily on Magnetic Resonance Imaging (MRI) due to its high sensitivity.
- Traditional diagnostic criteria (Paty's, Fazekas's, Barkhof's) have evolved with technological advancements, including contrast agents.
- Contrast enhancement in MRI offers confidence levels comparable to detecting specific lesion counts on T2-weighted imaging.
Purpose:
- To establish MRI as the primary paraclinical test for suspected MS, enabling diagnosis from the first clinical presentation.
- To facilitate early treatment discussions by confirming disease progression and dissemination.
- To refine diagnostic categories, moving away from 'clinically defined MS' towards confirmed or ruled-out diagnoses, with 'possible MS' for ambiguous cases.
Summary:
- MRI is now the initial diagnostic test for suspected MS, allowing diagnosis after a single clinical event by assessing spatial and temporal dissemination.
- The use of contrast agents enhances diagnostic confidence, equivalent to identifying specific lesion loads.
- Current MRI applications support early diagnosis and treatment initiation, aiming to prevent disease progression.
Impact:
- Early diagnosis through MRI can lead to timely intervention, potentially altering the disease's course.
- The evolution of MRI criteria supports definitive MS diagnosis, reducing diagnostic uncertainty.
- Emerging MRI techniques like magnetisation transfer, spectroscopy, and diffusion imaging hold promise for improved prognostic evaluation and pathophysiological understanding of MS.