Repeated USMLE Questions Step 1- 209

A 12 year old child is brought to his psychiatric for an evaluation of abnormal behavior. His teachers contacted his parents several times because he always cheats and lies at school. He also shoots family dog with his BB gun although he gets in trouble doing that. He has no remorse on hitting other kids and has no concern about others' feelings.

Which of the following is the most likely diagnosis?

A- Schizophrenia

B- Attention-deficit hyperactivity disorder (ADHD)

C- Conduct disorder

D- Bipolar disorder






This boy has a typical presentation of conduct disorder. He enjoyed hurting animals as well as human beings. He lies constantly and has no remorse for any trouble he is causing. Most of the children with this disorder develop into antisocial personality disorder when they get older. Signs and symptoms don’t meet the criteria of other choices.

The correct answer is C