<unk>  is a rare condition, with only 1.7 cases per 100,000. A child affected with<unk>  shows normal development. Up until this point, the child has developed normally in the areas of language skills, social skills, comprehension skills, and has maintained those skills for about two years. However, between the ages of two and ten, skills acquired are lost almost completely in at least two of the following six functional areas: * Expressive language skills (being able to produce speech and communicate a message) * Receptive language skills (comprehension of language – listening and understanding what is communicated) * Social skills and self care skills * Control over bowel and bladder * Play skills * Motor skills Lack of normal function or impairment also occurs in at least two of the following three areas: * Social interaction * Communication * Repetitive behavior and interest patterns In her book, Thinking in Pictures, Temple Grandin argues that compared to "Kanner's classic autism" and to Asperger syndrome,<unk>  is characterized with more severe sensory processing<unk>  but less severe cognitive problems. She also argues that compared to most autistic individuals, persons with<unk>  have more severe speech pathology and they usually do not respond well to stimulants.
Childhood disintegrative disorder
Epilepsy
Childhood schizophrenia
HIV/AIDS
Conduct disorder
Brain tumor
Personality development disorder
Rett syndrome