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Mimics and chameleons in motor neurone disease
Martin R Turner1, Kevin Talbot
1University of Oxford Nuffield Department of Clinical Neurosciences, Oxford, UK. martin.turner@ndcn.ox.ac.uk
Abstract:
The progression of motor neurone disease (MND) is currently irreversible, and the grave implications of diagnosis naturally fuels concern among neurologists over missing a potential mimic disorder. There is no diagnostic test for MND but in reality there are few plausible mimics in routine clinical practice. In the presence of a progressive pure motor disorder, signs such as florid fasciculations, bilateral tongue wasting, the 'split hand', head drop, emotionality, and cognitive or behavioural impairment carry high positive predictive value. MND is clinically heterogeneous, however, with some important chameleon-like presentations and considerable variation in clinical course. Lack of confidence about the scope of such variation, or an approach to diagnosis emphasising investigations over clinical common sense, has the potential to exacerbate diagnostic delay in MND and impede timely planning of the care which is essential to maximising quality of life.
Insights
Motor neurone disease (MND) diagnosis requires careful clinical assessment, as mimics are rare but can cause delays. Recognizing key motor and non-motor signs aids accurate and timely diagnosis for better patient care.
Area of Science:
- Neurology
- Clinical Neuroscience
Background:
- Motor neurone disease (MND) progression is irreversible, necessitating accurate diagnosis to avoid delays.
- The absence of a definitive diagnostic test for MND increases the risk of misdiagnosis.
- Neurologists face challenges due to MND's heterogeneous presentations and potential mimic disorders.
Purpose of the Study:
- To highlight key clinical signs with high predictive value for MND.
- To discuss the diagnostic challenges and potential mimics of MND.
- To emphasize the importance of clinical assessment in timely MND diagnosis and care planning.
Main Methods:
- Clinical review of motor neurone disease presentations.
- Analysis of diagnostic signs and their predictive value.
- Discussion of differential diagnoses and diagnostic pitfalls.
Main Results:
- Specific signs like fasciculations, tongue wasting, and 'split hand' indicate MND.
- Cognitive, behavioral, and emotional changes can also be present.
- Despite heterogeneity, distinct clinical features aid diagnosis in most cases.
Conclusions:
- Accurate clinical evaluation is paramount for diagnosing motor neurone disease.
- Prompt diagnosis of MND is crucial for effective patient care and quality of life.
- Distinguishing MND from rare mimics requires a combination of specific clinical signs and careful assessment.
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