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Amyotrophic lateral sclerosis
von Hippel-Lindau disease
Acoustic neuroma (schwannoma)
Adult brain tumors
Pediatric brain tumors
Transient ischemic attack
Cavernous sinus thrombosis
Spinocerebellar ataxia (NORD)
Tethered spinal cord syndrome
Lewy body dementia
Normal pressure hydrocephalus
Acute disseminated encephalomyelitis
Central pontine myelinolysis
JC virus (Progressive multifocal leukoencephalopathy)
Idiopathic intracranial hypertension
Opsoclonus myoclonus syndrome (NORD)
Restless legs syndrome
Early infantile epileptic encephalopathy (NORD)
Cauda equina syndrome
Treponema pallidum (Syphilis)
Vitamin B12 deficiency
Concussion and traumatic brain injury
Spinal muscular atrophy
Carpal tunnel syndrome
Thoracic outlet syndrome
Lambert-Eaton myasthenic syndrome
Adult brain tumors: Pathology review
Central nervous system infections: Pathology review
Cerebral vascular disease: Pathology review
Congenital neurological disorders: Pathology review
Dementia: Pathology review
Demyelinating disorders: Pathology review
Headaches: Pathology review
Movement disorders: Pathology review
Neurocutaneous disorders: Pathology review
Neuromuscular junction disorders: Pathology review
Pediatric brain tumors: Pathology review
Seizures: Pathology review
Spinal cord disorders: Pathology review
Traumatic brain injury: Pathology review
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Spinocerebellar ataxia or SCA refers to a group of rare genetically inherited conditions, caused by mutations in several types of SCA genes.
These mutations result in degenerative changes in the cerebellum and often, the spinal cord, which causes progressive problems with coordination and balance, known as ataxia.
The cerebellum sits at the back of the skull, posterior to the brainstem.
Neurons send their axons carrying input from the spinal cord, the brain and the internal ear through the brainstem into the cerebellum.
Once there, the cerebellum uses this information to coordinate and plan movement as well as maintain balance.
So, with mutations in the SCA genes, the cerebellum, along with the spinal cord, slowly degenerate.
In fact, many different gene mutations have been identified, each of which is known to cause different types of spinocerebellar ataxia.
The types are described using "SCA" followed by a number, according to their order of identification, so there’s SCA1 through SCA48, with SCA3 being the most common type.
However, in about 40% to 25% of the cases, the causative genes are still unknown.
Now, most of these gene mutations are inherited in an autosomal dominant pattern, meaning that one copy of an altered SCA gene is enough to cause the disease.
Affected individuals have a 50% chance of passing on the altered gene to their child, causing that child to have the disease.
In some cases, the involved gene contains a triplet repeat, where the nucleotides C, A, and G are repeated multiple times in a row.
And since CAG codes for the amino acid glutamine, the encoded protein will have multiple extra glutamines in a row.
The specific way in which extra glutamines causes the disease’s symptoms isn’t fully understood, but the abnormal protein seems to aggregate within the neurons of the cerebellum and spinal cord, causing them to die.
The expanded CAG repeats also affect DNA replication itself.
Spinocerebellar ataxia or SCA is a progressive, genetic, and often fatal neurodegenerative disorder with multiple types, caused by SCA gene mutations. These mutations result in degenerative changes in the cerebellum and the spinal cord, which causes progressive problems with coordination and balance, known as ataxia.
Symptoms of SCA vary depending on the subtype, but common ones include gait abnormalities, limb ataxia, dysarthria, nystagmus, and progressive difficulty with balance and coordination. Some subtypes of SCA can also cause vision problems, hearing loss, and cognitive impairment.
Diagnosis includes neuroimaging and genetic sequencing, and treatment options are mainly focused on managing symptoms and improving quality of life since there is no definitive cure. Physical therapy can help to maintain mobility and prevent falls, while speech therapy can help to improve communication abilities. In some cases, medications can be used to manage symptoms such as tremors or spasticity.
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