A 9-year-old boy is brought to the child psychiatry clinic by his mother with complaints of persistent disobedience and aggressive behaviour at home and school for the past 18 months. The mother reports that he frequently argues with authority figures, deliberately annoys peers, and has been caught stealing small items from shops twice in the past 6 months. He denies remorse for his actions and blames others for his problems. He has been suspended from school twice for fighting with classmates. His father is an alcoholic and frequently uses physical punishment. On mental status examination, he is irritable, shows poor eye contact, and displays no guilt or anxiety about his behaviour. There is no history of fire-setting, animal cruelty, or serious physical aggression causing injury. What is the most likely diagnosis?

Explanation

## Diagnostic Formulation This case presents a 9-year-old boy with a constellation of behaviours that meet criteria for **Conduct Disorder** rather than ODD. ### Key Distinguishing Features **Key Point:** The presence of **rule violations and harm to others or property** (theft, fighting causing school suspension) places this firmly in Conduct Disorder territory. ODD is limited to defiance, arguing, and annoyance of others — it does NOT include violation of others' rights or societal norms. ### DSM-5 Criteria Mapping | Feature | ODD | Conduct Disorder | |---------|-----|------------------| | **Defiance/arguing** | ✓ Present | ✓ Present | | **Violation of rights** | ✗ Absent | ✓ Present (theft, aggression) | | **Rule violation** | ✗ Absent | ✓ Present (school suspension) | | **Remorse/guilt** | Often present | Absent (as in this case) | | **Harm to others/property** | Minimal | Significant | **High-Yield:** This boy exhibits **theft** (violation of property rights) and **repeated physical aggression** (school suspensions for fighting) — both are Conduct Disorder criteria, not ODD. ### Childhood-Onset Type Justification **Clinical Pearl:** Onset at age 9 with sustained symptoms for 18 months meets the **childhood-onset specifier** (onset before age 10). The absence of fire-setting, animal cruelty, or serious injury (which would suggest callous-unemotional traits) is noted but does not exclude the diagnosis. ### Contextual Risk Factors - Paternal alcoholism and physical punishment (environmental stressor) - Poor attachment and modelling of aggression - Lack of remorse (suggests lower empathy) **Mnemonic: CONDUCT** — **C**onflict with rules, **O**ther's rights violated, **N**o remorse, **D**efiance + aggression, **U**nder-socialized, **C**ruelty (variable), **T**heft, **D**isruption ### Why Conduct Disorder, Not ODD? ODD is a **disorder of defiance and irritability** confined to the home/school relationship with authority. Conduct Disorder is a **disorder of socialization** involving violation of others' fundamental rights and major societal rules. This boy has crossed that threshold with theft and assault. [cite:DSM-5 Child and Adolescent Disorders]