Ataxia telangiectasia is a rare genetic disorder that affects the immune system, nervous system, and many other parts of the body. There are several synonyms for ataxia telangiectasia, including Louis-Bar syndrome, AT syndrome, ataxia-telangiectasia complex, and Boder-Sedgwick syndrome. These terms all refer to the same condition and are often used interchangeably. Ataxia telangiectasia is characterized by a variety of symptoms, including problems with coordination and balance, weakened immune function, and an increased risk of developing certain cancers. While there is no cure for ataxia telangiectasia, early diagnosis and treatments can help manage symptoms and improve quality of life for individuals affected by this condition.