Clinically isolated syndrome
initial neurological episode related to nerve tissue
A clinically isolated syndrome (CIS) is a clinical situation of an individual's first neurological episode, caused by inflammation or demyelination of nerve tissue. An episode may be monofocal, in which symptoms present at a single site in the central nervous system, or multifocal, in which multiple sites exhibit symptoms. CIS with enough paraclinical evidence can be considered as a clinical stage of multiple sclerosis (MS). It can also be retrospectively diagnosed as a kind of MS when more evidence is available.
Brain lesions associated with a clinically isolated syndrome may be indicative of several neurological diseases, like multiple sclerosis (MS) or neuromyelitis optica. In order for such a diagnosis, multiple sites in the central nervous system must present lesions, typically over multiple episodes, and for which no other diagnosis is likely. A clinically definitive diagnosis of MS is made once an MRI detects lesions in the brain, consistent with those typical of MS. Other diagnostics include cerebrospinal fluid analysis and evoked response testing.
Currently it is considered that the best predictor of future development of clinical multiple sclerosis is the number of T2 lesions visualized by magnetic resonance imaging during the CIS and their size. It is normal to evaluate diagnostic criteria against the "time to conversion to definite".
In 2001, the International Panel on the Diagnosis of multiple sclerosis issued the McDonald criteria, a revision of the previous diagnostic procedures to detect MS, known as the Poser criteria.
The public source identifies “Clinically isolated syndrome” as initial neurological episode related to nerve tissue. This brief keeps that definition visible, then builds a research path around Clinically, isolated and syndrome.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 8, 2026. The linked authority identifier is Q338802. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2001.
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This entry incorporates text from “Clinically isolated syndrome” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.