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SMA 4 (Adult onset) Adulthood This denotes the adult-onset form, sometimes also classified as a late-onset SMA type 3. It occurs in approx. 5% of patients and usually manifests in the third or fourth decade of life. The symptoms consist of gradual weakening of leg muscles, which frequently makes it necessary for the patient to use walking aids.
Spinal muscular atrophies (SMAs) are a genetically and clinically heterogeneous group of rare debilitating disorders characterised by the degeneration of lower motor neurons (neuronal cells situated in the anterior horn of the spinal cord) and subsequent atrophy (wasting) of various muscle groups in the body. [1]
Superior mesenteric artery compressing the duodenum, featuring the superior mesenteric artery syndrome. Superior mesenteric artery (SMA) syndrome is a gastro-vascular disorder in which the third and final portion of the duodenum is compressed between the abdominal aorta (AA) and the overlying superior mesenteric artery.
Spinal and bulbar muscular atrophy (SBMA), popularly known as Kennedy's disease, is a rare, adult-onset, X-linked recessive lower motor neuron disease caused by trinucleotide CAG repeat expansions in exon 1 of the androgen receptor (AR) gene, which results in both loss of AR function and toxic gain of function.
Hoffmann syndrome is a rare form of hypothyroid myopathy and is not to be confused with Werdnig-Hoffmann disease (a type of spinal muscular atrophy). It was first documented in 1897 by Johann Hoffmann. [1] It has adult-onset symptoms and is comparable to the childhood-onset Kocher–Debré–Semelaigne syndrome.
The safety and efficacy of risdiplam in infantile-onset and later-onset SMA has been evaluated in ongoing clinical trials. [9] [17] [18] In the infantile-onset SMA study, an open-label trial with 41 participants, efficacy was established based on the ability to sit without support for at least five seconds.
Nusinersen, [7] marketed as Spinraza, [4] is a medication used in treating spinal muscular atrophy (SMA), a rare neuromuscular disorder. [8] [4] In December 2016, it became the first approved drug used in treating this disorder.
Distal spinal muscular atrophy type 1 (DSMA1), also known as spinal muscular atrophy with respiratory distress type 1 (SMARD1), is a rare neuromuscular disorder involving death of motor neurons in the spinal cord which leads to a generalised progressive atrophy of body muscles.
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