biology

Radiologically isolated syndrome (multiple sclerosis)

Radiologically isolated syndrome (multiple sclerosis) is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Radiologically isolated syndrome (multiple sclerosis) rather than just read about it. In short: Radiologically isolated syndrome (RIS) is a clinical situation in which a person has white matter lesions suggestive of multiple sclerosis (MS), as shown on an MRI scan that was done for reasons unrelated to MS symptoms. The nerve lesions in these people show dissemination in space with an otherwise normal neurological examination and without historical accounts of typical MS symptoms.

Key takeaways

Radiologically isolated syndrome (multiple sclerosis) belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Radiologically isolated syndrome (multiple sclerosis) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Radiologically isolated syndrome (multiple sclerosis) from memory before moving on to harder problems.

Reference excerpt

Radiologically isolated syndrome (RIS) is a clinical situation in which a person has white matter lesions suggestive of multiple sclerosis (MS), as shown on an MRI scan that was done for reasons unrelated to MS symptoms. The nerve lesions in these people show dissemination in space with an otherwise normal neurological examination and without historical accounts of typical MS symptoms. MRI findings that are consistent with multiple sclerosis have been observed in healthy people who underwent MRI scanning, and 50% go on to develop symptomatic MS, sometimes with a primary progressive course. This condition was first characterized in 2009.

Diagnosis The criteria for an RIS diagnosis are as follows:

The presence of incidental MRI findings in the CNS white matter: Ovoid and well-circumscribed homogeneous foci, with or without involvement of the corpus callosum T2 hyperintensities larger than 3 mm in diameter, which fulfill at least 3 of the 4 Barkhof MRI criteria for DIS The CNS abnormalities are not consistent with a vascular condition No historical accounts of clinical symptoms consistent with neurological dysfunction. MRI anomalies do not account for apparent impairment in social, occupational, or generalized areas of functioning. MRI anomalies are not due to substance abuse, such as recreational drug use, toxic exposure, or a prior known medical condition. Exclusion of a differential diagnosis of leukoaraiosis, or extensive white matter pathology excluding the corpus callosum. MRI anomalies of the CNS are not accounted for by another disease.

Discovery RIS is discovered when an MRI scan is performed for other reasons. The most common symptom that led to the incidental discovery of RIS is headache. Other common reasons are trauma, psychiatric disorders, and endocrinological disorders.

Management Currently, routine clinical follow-up and MRI neuroimaging surveillance is the standard by which patients are observed. While treatment of MS disease modifying therapies have been given to some individuals with RIS, the majority opt for active surveillance and the appearance of clinical symptoms before commencing treatment, as treatment is considered controversial.

Prognosis In a 5 year study, clinical events, which refers to the first symptoms of exacerbations, clinical attacks, flare ups, or severe symptoms, indicative of MS, appeared in 34% of individuals. Of those who developed symptoms, 9.6% fulfilled criteria for primary progressive multiple sclerosis (PPMS).

Epidemiology Due to the incidental nature of RIS, exact figures on prevalence is unknown, though it has been suggested that RIS is the most common type of asymptomatic MS. The prevalence may be higher in relatives of patients with MS. One study, at a university hospital that is located in a high region of MS disease incidence, put the disease prevalence at approximately 1 in 2000. An earlier study in 1961 of 15,644 autopsies found 12 cases (0.08%) of unexpected MS findings without a previous history of MS symptoms. The mean age of first indication of RIS from 451 patients is 37.2 years.

RIS in children Though rare, some children that have had MRI scans for reasons unrelated to MS have shown signs of RIS. The most common reason for an initial MRI in these children was a headache. The first occurrence of a clinical event characteristic of MS in nearly half of the children examined was 2 years, though in a majority of cases, 'radiologic evolution', i.e. the increase in the number of size of lesions as detected in subsequent MRI, developed after one year. The presence of oligoclonal bands in the CSF and spinal cord lesions were associated with an increased risk of a first clinical event characteristic of MS. It was found that children with RIS had a substantial risk of subsequent clinical symptoms and/or radiologic evolution.

Research directions Calls have been made for longer prospective studies, tracking the development of potential disease progression over a longer period of time are warranted. This would ensure criteria in RIS is satisfactory and whether consideration should be given to treating individuals with RIS on current MS medication. RIS has been linked to prodromal multiple sclerosis.

Etymology The acronym RIS was coined in 2009 by Okuda and colleagues. Siva and colleagues suggested an alternate name, radiologically uncovered asymptomatic possible inflammatory-demyelinating disease (RAPIDD).

References

Worked examples

Example 1 — a first encounter with Radiologically isolated syndrome (multiple sclerosis)

Start with the simplest possible case. Write down what Radiologically isolated syndrome (multiple sclerosis) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Radiologically isolated syndrome (multiple sclerosis) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Radiologically isolated syndrome (multiple sclerosis) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Radiologically isolated syndrome (multiple sclerosis)

In research: Radiologically isolated syndrome (multiple sclerosis) appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Radiologically isolated syndrome (multiple sclerosis) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Radiologically isolated syndrome (multiple sclerosis) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Multiple sclerosis, Neurological disorders, Rare syndromes, so understanding it makes those chapters shorter.
In everyday life: Look for Radiologically isolated syndrome (multiple sclerosis) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Radiologically isolated syndrome (multiple sclerosis)” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Radiologically isolated syndrome (multiple sclerosis) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Radiologically isolated syndrome (multiple sclerosis) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Radiologically isolated syndrome (multiple sclerosis) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Radiologically isolated syndrome (multiple sclerosis) in simple terms?

Why does Radiologically isolated syndrome (multiple sclerosis) matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Radiologically isolated syndrome (multiple sclerosis)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Radiologically isolated syndrome (multiple sclerosis).