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- The Diagnostic Scheme
The International Panel on MS Diagnosis presents revised diagnostic criteria for multiple sclerosis (MS). The focus remains on the objective demonstration of dissemination of lesions in both time and space. Magnetic resonance imaging is integrated with clinical and other paraclinical diagnostic methods. The revised criteria facilitate the diagnosis of MS in patients with a variety of presentations, including “monosymptomatic” disease suggestive of MS, disease with a typical relapsing-remitting course, and disease with insidious progression, without clear attacks and remissions. Previously used terms such as “clinically definite” and “probable MS” are no longer recommended. The outcome of a diagnostic evaluation is either MS, “possible MS” (for those at risk for MS, but for whom diagnostic evaluation is equivocal), or “not MS.”
Because no single clinical feature or diagnostic test is sufficient for the diagnosis of multiple sclerosis (MS), diagnostic criteria have included a combination of both clinical and paraclinical studies.1, 2 The last formal review of criteria for MS diagnosis occurred in 1982,2 at which time degrees of diagnostic certainty were identified by categories ranging from clinically definite diagnosis to laboratory-supported definite MS, clinically probable MS, and laboratory-supported probable MS.
In July, 2000, the International Panel on the Diagnosis of MS was convened in London, United Kingdom, under the auspices of the U.S. National Multiple Sclerosis Society and the International Federation of MS Societies to reassess existing diagnostic criteria and to recommend, if necessary, appropriate changes. The Panel set out to create diagnostic criteria that could be used by the practicing physician and that could be adapted, as necessary, for clinical trials. The Panel also set out to integrate magnetic resonance imaging (MRI) into the overall diagnostic scheme because of its unique sensitivity to pathological change and to include a scheme for the diagnosis of primary progressive disease3—that characterized by the absence of relapses or remissions from onset—because neither had been sufficiently defined or integrated into existing diagnostic criteria for MS. The Panel also sought to clarify certain definitions currently used in the diagnosis of MS and, when possible, to simplify the diagnostic classification and descriptions. While refining the diagnostic criteria to reflect improved understanding of the disease and new technologies, the Panel wished to retain as many as possible of the useful features of existing criteria. Among general outcomes of the discussion, the Panel concluded the following.
Obtaining objective evidence of dissemination in time and space of lesions typical of MS is essential in making a secure diagnosis, as is the exclusion of other, better explanations for the clinical features.
Clinical evidence depends primarily on objectively determined clinical signs. Historical accounts of symptoms may lead to a suspicion of the disease but cannot be sufficient on their own for a diagnosis of MS. A diagnosis of MS on purely clinical evidence remains possible if there is objective evidence of lesions separated in time and space.
Radiological and laboratory investigations, including MRI, analysis of cerebrospinal fluid (CSF), and visual evoked potentials (VEP), can add to a clinical diagnosis and may be essential in making a diagnosis when clinical presentation alone does not allow a diagnosis to be made. These tests provide different types of information, and their value depends on the context in which the diagnosis is being made. Each has limitations of sensitivity and specificity. Imaging is viewed as the most sensitive and specific of these in making an MS diagnosis. Because CSF adds a different kind of information—about inflammation and immunological disturbance—it may be useful in situations when the clinical picture is unusual or the imaging criteria for diagnosis are not fulfilled. VEP may provide additional support, particularly in situations in which MRI abnormalities are few (eg, in patients with primary progressive MS with progressive myelopathy) or when MRI abnormalities have lesser specificity (eg, in older individuals with risk factors for microvascular ischemic disease or in individuals with abnormal radiological findings that do not satisfy the MRI specificity criteria for diagnosis). Other types of evoked potential analysis were viewed as contributing little to the diagnosis of MS.4
Following a diagnostic evaluation, an individual is usually classified either as having MS or as not having MS. A patient with appropriate clinical presentation who has not yet been evaluated, or whose evaluation meets some but not all of the necessary criteria, is considered to have “possible MS.” Subcategories that define the types of studies used in the diagnostic workup (“clinically definite,” “laboratory supported,” etc.) are unnecessary.
The Diagnostic Scheme
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- The Diagnostic Scheme
Table 3 indicates the steps that should be undertaken in making a diagnosis of MS. In this scheme, the mode of clinical presentation is indicated in the left column. The data needed to make an MS diagnosis are indicated, for each presentation, in the right column. Failure to satisfy the criteria for an MS diagnosis will result in either a “possible MS” diagnosis, pending further analysis, or classification as “not MS.” The order in the table of “clinical presentation” is deliberate; the Panel believes that a diagnosis is simplest in the case of “two attacks, clinical evidence of two or more lesions” and becomes increasingly difficult through “insidious neurological progression suggestive of MS.” The additional criteria needed to make a diagnosis of MS, therefore, become more stringent as the clinical evidence upon presentation becomes weaker. As is made clear below, follow-up with additional clinical assessments, laboratory investigation, and in particular MRI is important when a diagnosis cannot be made on clinical criteria alone at first presentation.
Table 3. Diagnostic Criteria
|Clinical Presentation||Additional Data Needed for MS Diagnosis|
|Two or more attacks; objective clinical evidence of 2 or more lesions||Nonea|
|Two or more attacks; objective clinical evidence of 1 lesion||Dissemination in space, demonstrated byMRIborTwo or more MRI-detected lesions consistent with MS plus positive CSFcorAwait further clinical attack implicating a different site|
|One attack; objective clinical evidence of 2 or more lesions||Dissemination in time, demonstrated byMRIdorSecond clinical attack|
|One attack; objective clinical evidence of 1 lesion (monosymptomatic presentation; clinically isolated syndrome)||Dissemination in space, demonstrated byMRIborTwo or more MRI-detected lesions consistent with MS plus positive CSFcandDissemination in time, demonstrated byMRIdor Second clinical attack|
|Insidious neurological progression suggestive of MS||Positive CSFcandDissemination in space, demonstrated by1) Nine or more T2 lesions in brain or 2) 2 or more lesions in spinal cord, or 3) 4–8 brain plus 1 spinal cord lesionorabnormal VEPe associated with 4–8 brain lesions, or with fewer than 4 brain lesions plus 1 spinal cord lesion dem onstrated by MRIandDissemination in time, demonstrated byMRIdorContinued progression for 1 year|
Two or More Attacks, Objective Clinical Evidence of Two or More Lesions
Two clear attacks typical of MS, documented by objective evidence of two lesions separated in time and necessarily separated in space may be sufficient to make an MS diagnosis solely on clinical grounds. No additional tests may be needed. However, it would be expected that one or more such tests—MRI, CSF, or VEP—would be abnormal were they done. If these tests are undertaken and are not abnormal in a manner typical of MS, extreme caution must be taken in making a diagnosis of MS. It must be stressed that there should be no better explanation than MS for the clinical picture.
Two or More Attacks, Objective Clinical Evidence of One Lesion
To make a diagnosis of MS, objective evidence of a second lesion is required to demonstrate dissemination in space. This can be provided by an MRI scan of the brain fulfilling criteria derived from Barkhof et al6 and Tintoré et al7 (see Table 1). A spinal cord lesion can be substituted for one of the brain lesions. Alternatively, should MRI data fall short of these requirements, the presence of at least two brain lesions or one brain and one spinal cord lesion consistent with MS, coupled with abnormal CSF analysis (to avoid misdiagnosing nonspecific vascular lesions as inflammatory), can be used to document dissemination in space. Alternatively, if MRI is not performed, the occurrence of a further clinical attack implicating a different site will fulfill criteria for dissemination in space.
One Attack, Objective Clinical Evidence of Two or More Lesions
To make a diagnosis of MS, dissemination in time must be demonstrated. This can be done by MRI, although careful consideration must be given to the timing of the clinical event and subsequent scans (see Table 2). There must be a minimum of 3 months between the clinical event and evidence for a new lesion. (This interval is arbitrary, but it reduces the risk of misdiagnosing MS in cases of acute disseminated encephalomyelitis with a stuttering onset.17) Alternatively, if MRI tests are not performed, the occurrence of a second clinical attack is necessary to fulfill criteria for dissemination in time.
One Attack, Objective Clinical Evidence of One Lesion
To make a diagnosis of MS, dissemination of lesions both in space and in time will have to be demonstrated. The typical situation is the patient presenting solely with a clinically isolated syndrome suggestive of MS (so-called monosymptomatic presentation). A diagnosis of MS then requires 1) evidence of dissemination in space through detection of lesions using MRI as described above (see also Table 1) or, lacking such solid evidence, at least two brain lesions plus positive CSF, and 2) evidence of dissemination in time demonstrated as for the patient presenting with one attack and clinical evidence of two lesions (see above and Tables 2, 3). In this situation as well, if MRI tests are not performed, the occurrence of a second clinical attack implicating a different site will fulfill criteria for dissemination in time and space.
Insidious Neurological Progression Suggestive of Multiple Sceloris
This is often a difficult presentation for a diagnosis of MS, in that typical relapses are absent and dissemination in time and in space of separate events may be difficult to determine. The Panel had particular difficulty in reaching a consensus on the criteria for diagnosis in this clinical group, because the amount of published follow-up data for this is much less than for other modes of clinical presentation. For this reason, the stringent criteria proposed in a recent position paper3 serve as the basis for the proposed diagnostic criteria. The Panel recognizes that modifications may be appropriate as more information becomes available.
With this mode of clinical presentation, to make a secure diagnosis of MS, the majority of the Panel considered that an abnormal CSF finding with evidence of inflammation and immune abnormality is essential and that evidence is required of dissemination in space (using MRI or abnormal VEP) and time (using MRI or continued progression of disability for 1 year). When these criteria are fulfilled, the diagnosis is “primary progressive MS” (see Table 3).
No Better Explanation
The Panel emphasizes that, even if the clinical evidence and paraclinical studies are strongly indicative of MS, there must be no better explanation for the clinical and paraclinical abnormalities than MS for a secure diagnosis to be made.
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- The Diagnostic Scheme
The diagnosis of MS has traditionally relied upon accumulation of information, clinical and paraclinical, that leads to a positive diagnosis and can help to eliminate alternative diagnoses. Among the key indicators is evidence that the disease is inflammatory, whether recurrent or progressive. The International Panel on the Diagnosis of MS reaffirms the need to demonstrate dissemination of clinical events and lesions in space and time, long-held criteria for MS diagnosis, and the diagnostic scheme presented is organized to emphasize this point. Requiring objective clinical evidence of attacks or progression (symptoms alone are not enough) is a renewed emphasis but one that the Panel believes is essential because of the implications of the diagnosis of MS for treatment.
The criteria presented in this report are intended for use by the practicing physician, and it is expected that in most cases these clinicians will have access to the technologies required for the diagnostic workup. However, the Panel recognizes that in some parts of the world access to advanced technologies such as MRI is limited; if so, and if no alternatives to imaging (such as analysis of CSF and VEP) are available, a diagnosis of “possible MS” will be made until the subsequent clinical course allows the criteria of at least two attacks and clinical evidence of at least two separate lesions to be fulfilled.
It is further recognized that the methods and sensitivity of paraclinical testing and analysis vary worldwide. The Panel's recommendations are predicated on the availability of highest quality, state-of-the-art technology related to imaging, CSF analysis, and evoked potential recording. For example, in the use of imaging to document dissemination of lesions in time, accurate repositioning and coregistration of scans may be necessary to determine whether some of the lesions appearing on a follow-up scan are new.18 When a physician is not ensured of the quality and reproducibility of any paraclinical analyses, extreme care must be taken in using the results as evidence supporting a diagnosis of MS. It is hoped that these recommendations will encourage greater uniformity and reliability in the use of such technologies.
The Panel's recommendations represent a pragmatic approach to allow a diagnosis of MS in the most typical clinical presentations. It is important to note that the recommendations are based on data and experience available primarily from adults with typical features of MS and that these criteria would best apply to individuals between 10 and 59 years of age and in cases in which the clinical presentation is reasonably suggestive of MS. Special care must be taken in making a diagnosis of MS in those who are younger or older at presentation, those with a progressive onset, and those with unusual features or an “atypical” presentation, such as dementia, epilepsy, or aphasia. In such cases, additional evidence from CSF and VEP analysis may help in attaining security about a diagnosis of MS, even if these are not required for the more typical cases. For unusual cases, the importance of follow-up assessments cannot be overemphasized.
Several MS-like presentations and clinical syndromes present particular difficulties in considering a diagnosis of MS. A detailed discussion of differential diagnosis is beyond the scope of this paper, and the reader is referred to standard accounts of differential diagnosis.19 Nevertheless, several conditions that may be confused with MS should be kept in mind in assessing a patient for an MS diagnosis. These include multifocal areas of cerebral ischemia or infarction in young adults from such illnesses as phospholipid antibody syndrome, acute disseminated lupus erythematosis, CADASIL, Takayasu's disease, meningovascular syphilis, or even carotid dissection. Various infections such as HTLV1 and Lyme disease can present striking similarities to MS. Cerebellar ataxia presenting as a result of a paraneoplastic disorder in young adults may be a problem, especially because elevated IgG often occurs in the CSF in this illness. Monophasic demyelinating diseases such as acute disseminated encephalomyelitis, postviral Devic's syndrome, and some cases of acute transverse myelitis present special difficulties in diagnosis; a diagnosis should not be made in these circumstances unless new symptoms and signs or imaging abnormalities appear more than 3 months after clinical onset. Some regard recurrent demyelinating diseases such as acute disseminated encephalomyelitis with a stuttering onset, neuromyelitis optica (Devic's syndrome20), and recurrent longitudinally extensive transverse myelitis as separate diseases, but others regard them as variants of MS. Genetic disorders of myelin, such as the leukodystrophies, should be considered in certain settings, particularly among children and teenagers.
Clinical trials for evaluating new therapeutic agents and other clinical experimental protocols may require different diagnosis-related inclusion and exclusion criteria than those provided in the present recommended basic steps. Given the wide variation in presentation of MS, there must be some flexibility in the application of the new diagnostic scheme. A secure diagnosis, however, should be based on the elements presented here. It must always be remembered that there should be no better explanation for the clinical and investigative data obtained.
Whereas it might be said that the only proved diagnosis of MS can be made upon autopsy,21 or occasionally upon biopsy, where lesions typical of MS can be directly detected through standard histopathological techniques, MS is essentially a clinical problem and can be diagnosed using clinical and paraclinical criteria. Biopsy is a diagnostic technique that can confirm that a lesion is inflammatory and demyelinating (though it cannot on its own lead to a diagnosis of MS) and should rarely be undertaken. Interpretation by neuropathologists experienced in the demyelinating diseases is essential in avoiding misdiagnosis.
Imaging undertaken for other purposes occasionally uncovers “silent disease.” When such silent cases are uncovered, some degree of monitoring may be desirable.
The International Panel on MS Diagnostic Criteria built upon diagnostic recommendations for MS that have served the community well for decades. Key points include a continued emphasis on dissemination of lesions in time and space and on the value of paraclinical testing, especially imaging, as a key part of the overall diagnostic workup. Specific imaging criteria are presented. However, the diagnosis of MS remains a partly subjective and partly objective process. The diagnosis is best made by an expert who is familiar with the disease, its differential diagnoses, and the interpretation of paraclinical assessments (imaging, CSF analysis, and evoked potentials) that can supplement the diagnostic process.
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- The Diagnostic Scheme
The International Panel on MS Diagnosis was organized and supported by the U.S. National Multiple Sclerosis Society with additional support provided by the International Federation of Multiple Sclerosis Societies.
The Panel thanks Drs Massimo Filippi (Milan, Italy), David Miller (London, United Kingdom), Frederik Barkhof (Amsterdam, The Netherlands), Jürg Kesselring (Valens, Switzerland), Aaron Miller (Brooklyn, NY), and John Noseworthy (Rochester, MN) for their review of a draft version of the manuscript.