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What is Prader-Willi syndrome?

What is Prader-Willi syndrome?

Prader-Willi syndrome and Angelman syndrome are two rare chromosome disorders, with very different symptoms, but caused by the same area of ...more »

  • Prader-Willi syndrome: A rare genetic disorder characterized by reduced muscle tone, obesity and small hands and feet.
  • Prader-Willi syndrome: A syndrome characterized at birth by the lack of spontaneous movements and protective reflexes, thus giving an appearance of severe brain damage. Profound hypotonia may cause asphyxia. Sucking and swallowing reflexes are absent or decreased. Deficient thermoregulation, amyotonia, and hypogonadism are usually associated. After a few weeks or months, the affected infants become more responsive and more alert. Areflexia disappears gradually but hypotonia may persist longer. This phase is marked mainly by mental subnormality, delayed growth and motor development, speech defect, lack of emotional control, voracious appetite leading to obesity, hypotonia, hyperlaxity, delayed bone maturation, and multiple orofacial and other disoders. There is a tendency to develop diabetes mellitus and cardiac failure in some patients. Pain insensitivity is common. Prader-Willi habitus associated with osteopenia and camptodactyly is known as the Urban-Rogers-Meyer syndrome.
    Source - Diseases Database

Prader-Willi syndrome is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Prader-Willi syndrome, or a subtype of Prader-Willi syndrome, affects less than 200,000 people in the US population.
Source - National Institutes of Health (NIH)

Ophanet, a consortium of European partners, currently defines a condition rare when it affects 1 person per 2,000. They list Prader-Willi syndrome as a "rare disease".
Source - Orphanet

Prader-Willi syndrome: Introduction

Types of Prader-Willi syndrome:

Broader types of Prader-Willi syndrome:

How many people get Prader-Willi syndrome?

Prevalance of Prader-Willi syndrome: estimated 1 per 10,000 - 25,000 people suffer from Prader-Willi syndrome, Genetics Home Reference website
Prevalance Rate of Prader-Willi syndrome: approx 1 in 10,000 or 0.01% or 27,200 people in USA [about data]

How serious is Prader-Willi syndrome?

Complications of Prader-Willi syndrome: see complications of Prader-Willi syndrome

What causes Prader-Willi syndrome?

Causes of Prader-Willi syndrome: see causes of Prader-Willi syndrome

What are the symptoms of Prader-Willi syndrome?

Symptoms of Prader-Willi syndrome: see symptoms of Prader-Willi syndrome

Complications of Prader-Willi syndrome: see complications of Prader-Willi syndrome

Can anyone else get Prader-Willi syndrome?

Inheritance: see inheritance of Prader-Willi syndrome

Inheritance of genetic conditions: see details in inheritance of genetic diseases.

Prader-Willi syndrome: Testing

Diagnostic testing: see tests for Prader-Willi syndrome.

Misdiagnosis: see misdiagnosis and Prader-Willi syndrome.

How is it treated?

Treatments for Prader-Willi syndrome: see treatments for Prader-Willi syndrome
Research for Prader-Willi syndrome: see research for Prader-Willi syndrome

Name and Aliases of Prader-Willi syndrome

Main name of condition: Prader-Willi syndrome

Class of Condition for Prader-Willi syndrome: genetic chromosomal

Other names or spellings for Prader-Willi syndrome:

PWS, Willi-Prader syndrome, Prader Labhart Willi syndrome, Obesity, muscular hypotonia, mental retardation, short stature, hypogonadotropic hypogonadism, and small hands and feet

Labhardt-Willi-Prader-Fanconi syndrome Source - Diseases Database

Diminished fetal activity, obesity, muscular hypotonia, mental retardation, short stature, hypogonadotropic hypogonadism, and small hands and feet, PWS, Prader-Labhart-Willi syndrome, Willi-Prader syndrome
Source - Office of Rare Diseases (ORD) of the National Institutes of Health (NIH)

Prader-Willi syndrome: Related Conditions

Research the causes of these diseases that are similar to, or related to, Prader-Willi syndrome:

 

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