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Multifocal motor neuropathy (MMN) is a progressively worsening condition where muscles in the extremities gradually weaken. The disorder, a pure motor neuropathy syndrome, is sometimes mistaken for amyotrophic lateral sclerosis (ALS) because of the similarity in the clinical picture, especially if muscle fasciculations are present.
[49] [50] This latter condition was later termed multifocal motor neuropathy [51] This distinction is important because multifocal motor neuropathy responds to intravenous immunoglobulin alone, while chronic inflammatory demyelinating polyneuropathy responds to intravenous immunoglobulin, steroids and plasma exchange. [52]
Hirayama disease, also known as monomelic amyotrophy (MMA), [1] [2] is a rare motor neuron disease first described in 1959 in Japan. Its symptoms usually appear about two years after adolescent growth spurt and is significantly more common in males, with an average age of onset between 15 and 25 years.
The genetic factors are better understood than the environmental factors; no specific environmental factor has been definitively shown to cause ALS. A multi-step liability threshold model for ALS proposes that cellular damage accumulates over time due to genetic factors present at birth and exposure to environmental risks throughout life. [ 63 ]
These sensory, motor and autonomic fibres which make up peripheral nerves have specific functions, which means that their involvement in neuropathic disorders can lead to “diverse symptoms, signs and electrodiagnostic (EDx) features”, and a focus on such symptoms can be valuable in understanding and diagnosing varied cases of peripheral ...
Instead, a number of other possibilities have to be ruled out, such as multifocal motor neuropathy or spinal muscular atrophy. Tests used in the diagnostic process include MRI, clinical examination, and EMG. EMG tests in patients who do have PMA usually show denervation (neuron death) in most affected body parts, and in some unaffected parts too.
Motor neurone disease – see Amyotrophic lateral sclerosis; Motor skills disorder; Moyamoya disease; Mucopolysaccharidoses; Multifocal motor neuropathy; Multi-infarct dementia; Multiple sclerosis; Multiple system atrophy; Muscular dystrophy; Myalgic encephalomyelitis; Myasthenia gravis; Myelinoclastic diffuse sclerosis; Myoclonic ...
Motor neuron disease; Motor neuro-ophthalmic disorders; Motor neuropathy peripheral dysautonomia; Motor neuropathy; Motor sensory neuropathy type 1 aplasia cutis congenita; Mounier-Kuhn syndrome; Mount–Reback syndrome; Mousa Al din Al Nassar syndrome; Moyamoya disease