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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 vas deferens can grow back together after a vasectomy–thus resulting in vasectomy failure. [40] This occurs due to the fact that the epithelium of the vas deferens, similar to the epithelium of some other human body parts, is capable of regenerating and creating a new tube in the event that the vas deferens is damaged and/or severed. [41]
Degenerative disease is the result of a continuous process based on degenerative cell changes, affecting tissues or organs, which will increasingly deteriorate over time. [ 1 ] In neurodegenerative diseases , cells of the central nervous system stop working or die via neurodegeneration .
Muscle atrophy from intristic disease in an 18-year-old woman, weight 27 pounds (12.2 kg) Muscle atrophy from intristic disease in a 17-year-old girl with chronic rheumatism Muscle diseases, such as muscular dystrophy , amyotrophic lateral sclerosis (ALS), or myositis such as inclusion body myositis can cause muscle atrophy.
Atrophy is the partial or complete wasting away of a part of the body. Causes of atrophy include mutations (which can destroy the gene to build up the organ), poor nourishment, poor circulation, loss of hormonal support, loss of nerve supply to the target organ, excessive amount of apoptosis of cells, and disuse or lack of exercise or disease intrinsic to the tissue itself.
Steroid-induced skin atrophy [14] [15] is often permanent, though if caught soon enough and the topical corticosteroid discontinued in time, the degree of damage may be arrested or slightly improve. However, while the accompanying telangiectasias may improve marginally, the stretch marks are permanent and irreversible.
The type of symptoms experienced can depend on which areas of the body experience the loss in nerve supply. This denervation process is different from post-polio syndrome in that it involves only upper and lower motor neuron degeneration and does not involve constant reinnervation and denervation.
Lipodystrophy can appear as a lump or small dent in the skin that forms when a person performs injections repeatedly in the same spot. These types of lipodystrophies are harmless and can be avoided by changing (rotating) the locations of injections. For those with diabetes, using purified insulins and new needles with each injection may also help.