Robyn Thom, MD, is Assistant Professor of Psychiatry at Massachusetts General Hospital/McLean Hospital.Christopher McDougle, MD, is Professor of Psychiatry and Pediatrics and Director of the Lurie Center for Autism at Massachusetts General Hospital/McLean Hospital.

• 1. Young boy with social impairment and repetitive behaviors2. Persistent reading difficulty despite improved focus on a stimulant medication3. Below average intellectual and adaptive functioning4. A child with inattention, hyperactivity, and impulsivity5. Repetitive throat clearing, blinking, and grimacing6. Teenager with paranoia and hallucinations preceded by a decline in academic and social functioning7. Several weeks of low mood, decreased appetite, and poor sleep after changing schools8. An episode of giddy, irritable mood with increased energy and goal-directed activity9. Chronically irritable mood with frequent temper outbursts10. Limited speech outside the home in a young girl who speaks normally at home11. A fear of dogs12. Trouble being away from mother13. Worries about being embarrassed in front of classmates14. Recurrent episodes of intense fear, shortness of breath, racing heart, and sweating15. Excessive, uncontrollable worries16. A teenager who spends hours scrutinizing her skin17. Repeating, counting, and touching to prevent harm18. A girl without stranger danger19. A boy who could not be comforted20. Sad mood and changes in behavior after exposure to a traumatic reminder21. A child whose parent insists on recurrent medical admissions22. Decreased food intake after a choking incident23. A teenage girl with low body mass index due to restricting food intake24. Recurrent episodes of binging and purging25. A young boy with stool soiling26. An adolescent requesting to pause puberty27. An adolescent with binge drinking28. An adolescent with new onset inattention29. Confusion and mental status changes in a medically ill child