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Primary lateral sclerosis and Pierre Marie
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    Primary lateral sclerosis (PLS) is an idiopathic non-familial neurodegenerative disorder of upper motor neurones. It presents as a slowly progressive pyramidal tract syndrome, sometimes with marked pseudobulbar symptoms.

    The diagnosis is based on exclusion of other causes. Pringle and colleagues1 proposed diagnostic criteria in 1992 for PLS: adult onset; negative family history; duration of at least three years (to exclude motor neurone disease (ALS)); and normal blood, CSF, EMG, and MRI results. However, it remains an enigmatic, heterogeneous syndrome of uncertain nosology, for some clinically similar patients have varied patterns of symptom progression and physiology.2 MRS may show a reduction of N–acetylaspartate/creatinine in the motor cortex. Modern technology can exclude other disorders with an accuracy of about 90%. It is now frequently

    Often confused with ALS, its existence as an entity has been debated since the time of Pierre Marie. In his classic book, Lectures on diseases of the spinal cord,6 Pierre Marie observed:

    "In 1875, Erb7 and a few months later Charcot described an affection with pronounced ‘spasmodic paresis’ in the extremities, without loss of sensation. Erb believe this was due to primary degeneration of the lateral columns of the cord. Charcot was of the same opinion. This idea as to the nature of spasmodic spinal paralysis (name given by Erb) or spasmodic tabes dorsalis (name given by Charcot), thus at once gave it the right of being included in nervous pathology, but owing to a singular misfortune the autopsies of adult patients in whom the diagnosis...had been made, there was found either disseminated sclerosis or transverse, or focal myelitis, or perhaps amyotrophic lateral sclerosis; not a single case in fact occurred in which primary degeneration of the pyramidal tract existed...thus during the last few years the diagnosis of spasmodic tabes dorsalis has scarcely ever been made." p84

    Marie went on to say: "The diagnosis should be excluded from a ‘nosological catalogue’ with the exception of congenital spastic rigidity of the limbs", which he recognised as Little’s disease.

    It remains mandatory to exclude: compressive lesions at the foramen magnum and cervical cord, MS, Chiari malformation, and human immunodeficiency virus or human T-lymphotrophic virus type I. In PLS and in ALS morphometry shows small pyramidal cells in the precentral gyrus; and in PLS, quantitative histopathology shows the neuronal degeneration confined to the corticospinal system, without involvement of lower motor neurones.1 Its place in neurological taxonomy is still unclear.

    References

    Hudson AJ, Kiernan JA, Munoz DG, et al. Clinicopathological features of primary lateral sclerosis are different from amyotrophic lateral sclerosis. Brain Res Bull 1993;30:359–64.

    Zhai P, Pagan F, Statland J, et al. Primary lateral sclerosis: a heterogeneous disorder composed of different subtypes? Neurol 2003;22:1258–65.

    Marshall J. Spastic paraplegia of middle age: A clinicopathological study. Lancet 1955;1:643–6.

    Kuipers-Upmeijer J, de Jager AE, Hew JM, et al. Primary lateral sclerosis: clinical, neurophysiological, and magnetic resonance findings. J Neurol Neurosurg Psychiatry 2001;71:15–20.

    Younger DS, Chou S, Hays AP, et al. Primary lateral sclerosis. A clinical diagnosis reemerges. Arch Neurol 1988;45:1304–7.

    Marie P. Le?ons sur les maladies de la moelle. Paris, Masson 1892. English translation Montagu Lubbock. London: The New Sydenham Society, Vol CLII, 1895.

    Erb WH. Ueber einen wenig bekannten spinalen symptomencomplex. Berliner Klinische Wochenschrift 1875;12:357–9.(J M S Pearce)