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Intellectual Disability

Subnormal intellectual functioning which originates during the developmental period. This has multiple potential etiologies, including genetic defects and perinatal insults. Intelligence quotient (IQ) scores are commonly used to determine whether an individual has an intellectual disability. IQ scores between 70 and 79 are in the borderline range. Scores below 67 are in the disabled range. (from Joynt, Clinical Neurology, 1992, Ch55, p28)

Year introduced: 1967(1963)


Spastic Paraplegia 18, Autosomal Recessive [Supplementary Concept]

also known as SPG18 or IDMDC

Date introduced: August 24, 2012


ATR-X syndrome [Supplementary Concept]

A hereditary X-linked syndrome that occurs almost exclusively in males and affects multiple organ systems. In addition to intellectual disability and mild alpha-thalassemia, affected individuals may have distinct FACIES, ear, nose, and mouth abnormalities, MICROCEPHALY; ANEMIA; GASTROESOPHAGEAL REFLUX; CONSTIPATION and UROGENITAL ABNORMALITIES. Mutations and duplications in the ATRX gene have been identified. OMIM: 301040

Date introduced: August 25, 2010


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