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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.
Focal neurological deficits may be caused by a variety of medical conditions such as head trauma, [1] tumors or stroke; or by various diseases such as meningitis or encephalitis or as a side effect of certain medications such as those used in anesthesia. [2] Neurological soft signs are a group of non-focal neurologic signs. [3]
Peripheral neuropathy may be classified according to the number and distribution of nerves affected (mononeuropathy, mononeuritis multiplex, or polyneuropathy), the type of nerve fiber predominantly affected (motor, sensory, autonomic), or the process affecting the nerves; e.g., inflammation (), compression (compression neuropathy), chemotherapy (chemotherapy-induced peripheral neuropathy).
Focal demyelination is a hallmark of entrapment neuropathies, which are often characterized by nerve conduction slowing or block. [34] The initial changes are a break-down in the blood nerve barrier, followed by sub-perineurial edema and fibrosis; localized, then diffuse, demyelination occurs, and finally Wallerian degeneration. [33]
Diabetic neuropathy encompasses a series of different neuropathic syndromes which can be categorized as follows: [14] Focal and multifocal neuropathies: Mononeuropathy which affects one nerve; Amyotrophy or radiculopathy such as proximal diabetic neuropathy, affecting a specific pattern of nerves
Neuropathy has three sub-classifications; mononeuropathy is a result of an entrapped or traumatised nerve or nerve area, Mononeuropathy multiplex is linked to chronic diseases like leprosy, and polyneuropathy is an outcome of systemic, metabolic or toxic aetiology.
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