childhood disintegrative disorder
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childhood disintegrative disorder[¦chīld‚hu̇d dis′in·tə‚grād·iv dis‚ȯrd·ər]
A condition occurring in 3- and 4-year-old children that is characterized by unequivocally normal development in the first several years of life, followed by a marked developmental regression (a child who previously had been speaking in sentences becomes totally mute), and various autistic features develop. Also known as Heller's syndrome.