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NINDS Disorders is an index of neurological conditions provided by the National Institute of Neurological Disorders and Stroke. This valuable tool offers detailed descriptions, facts on treatment and prognosis, and patient organization contact information for over 500 identified neurological disorders.

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Neuroacanthocytosis

Neuroacanthocytosis refers to a group of genetic conditions that are characterized by movement disorders and acanthocytosis (abnormal, spiculated red blood cells). Four syndromes are classified as neuroacanthocytosis: Chorea-acanthocytosis, McLeod syndrome, Huntington's disease-like 2 (HDL2), and panthothenate kinase-associated neurodegeneration (PKAN). Acanthocytosis may not always be observed in HDL2 and PKAN. These disorders are caused by different genetic mutations, and the signs and symptoms vary, but usually include chorea (involuntary, dance-like movements), parkinsonism (slowness of movement), dystonia (abnormal body postures), and problems walking. There may also be muscle weakness, involuntary movements of the face and tongue, tongue/lip biting (which is mostly characteristic of Chorea-acanthocytosis), as well as difficulty with speech and eating, cognitive impairment, psychiatric symptoms, and seizures. Individuals with McLeod syndrome often have cardiac problems. Many features of these disorders are due to degeneration of the basal ganglia, a part of the brain that controls movement. Additional disorders that are also known have neurologic symptoms, acanthocytosis, and either lipoprotein disorders or systemic findings. The diagnosis of neuroacanthocytosis is typically based on the symptoms and clinical observation, a review of family history, and the evaluation of specific laboratory and imaging studies.

Treatment

There are currently no treatments to prevent or slow the progression of neuroacanthocytosis and treatment is symptomatic and supportive. Medications that block dopamine, such as some of the antipsychotics, may decrease the involuntary movements. Botulinum toxin injections usually improve symptoms of dystonia. A feeding tube may be needed for individuals with feeding difficulties to maintain proper nutrition. Seizures may be treated with a variety of anticonvulsants, and antidepressants may also be appropriate for some individuals. Speech, occupational, and physical therapy may also be beneficial.

Prognosis

Neuroacanthocytosis is a progressive disease, and in some cases may be complicated by poor nutritional status, cardiac abnormalities, and pneumonia.

Research

The NINDS supports research on disorders such as neuroacanthocytosis, aimed at increasing scientific understanding of the disorders and finding ways to prevent and treat them. The genetic mutations responsible for some types of neuroacanthocytosis have recently been identified. Researchers are examining the role of the basal ganglia in neuroacanthocytosis and hope to correlate the specific genetic abnormalities with the clinical features of the disease. Other research is aimed at identifying possible causes of sudden death related to heart muscle abnormalities, which are observed in some individuals with neuroacanthocytosis.

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Organizations

Office of Rare Diseases

National Institutes of Health, DHHS
6100 Executive Blvd., 3B01, MSC 7518
Bethesda, MD 20892-7518
Tel: 301-402-4336

National Library of Medicine (NLM)

National Institutes of Health, DHHS
8600 Rockville Pike, Bldg. 38, Rm. 2S10
Bethesda, MD 20894
Tel: 301-496-6308 888-346-3656

National Organization for Rare Disorders (NORD)

Federation of voluntary health organizations dedicated to helping people with rare "orphan" diseases and assisting the organizations that serve them. Committed to the identification, treatment, and cure of rare disorders through programs of education, advocacy, research, and service.

55 Kenosia Avenue
Danbury, CT 06810
Tel: 203-744-0100 Voice Mail 800-999-NORD (6673)
Fax: 203-798-2291

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