Delusional disorder is characterized by which feature that DISTINGUISHES it from schizophrenia?
- A Prominent negative symptoms
- B Non-bizarre, plausible delusions for ≥1 month without prominent hallucinations or disorganization ✓
- C Duration of illness less than 1 month
- D Auditory hallucinations are the primary symptom
Correct answer: B. Non-bizarre, plausible delusions for ≥1 month without prominent hallucinations or disorganization
Explanation
Delusional disorder is characterized by one or more non-bizarre (plausible, could happen in real life) delusions for ≥1 month, without prominent auditory/visual hallucinations, disorganized speech, disorganized behavior, or negative symptoms. Functioning is relatively preserved outside the delusion. Schizophrenia requires hallucinations, disorganization, or negative symptoms with 6 months' duration. Brief psychotic disorder lasts <1 month.
Reference: Kaplan & Sadock's Synopsis of Psychiatry, 11th ed.
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