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Difficulty: MediumSchizophrenia and Psychotic Disorders

A 27-year-old graduate student is brought to the university health clinic by his roommate. The roommate reports that for the past 14 weeks, the patient has been barricading himself in their shared apartment, claiming that rival researchers are trying to steal his thoughts using microwave beams. The patient has been hearing two voices arguing about his research outside his window, even when no one is there. He has not attended classes or bathed regularly during this time. Prior to this, he was a top-performing student with a wide circle of friends and no prior psychiatric history. Medical history is unremarkable. Vital signs and physical examination are within normal limits. A urine toxicology screen is negative. Which of the following is the most likely diagnosis?

  1. A
    Brief psychotic disorder
  2. B
    Delusional disorder
  3. C
    Schizoaffective disorder
  4. D
    Schizophrenia
  5. Schizophreniform disorderAnswer

Answer

Schizophreniform disorder
The correct diagnosis is schizophreniform disorder. The patient has clear active-phase symptoms of psychosis (delusions and auditory hallucinations) along with functional impairment. The defining feature for his diagnosis is the duration of his illness. His symptoms have been present for 14 weeks. According to DSM-5 criteria, schizophreniform disorder is diagnosed when symptoms of schizophrenia are present for at least 1 month but less than 6 months. If his symptoms persist beyond 6 months, the diagnosis would subsequently be changed to schizophrenia.

Step-by-Step Solution

1
Identify the primary psychiatric symptoms presented in the clinical vignette.
The patient exhibits paranoid delusions (belief that researchers are stealing thoughts via microwaves) and auditory hallucinations (hearing two voices arguing).
Establishing the presence of active-phase psychotic symptoms is required to navigate the differential diagnosis of psychotic disorders.
2
Assess the presence of major mood episodes.
There is no mention of a concurrent major depressive or manic episode.
The absence of prominent mood symptoms rules out schizoaffective disorder, bipolar disorder with psychotic features, and major depressive disorder with psychotic features.
3
Determine the total duration of the current symptomatic episode.
The symptoms have been present continuously for 14 weeks (approximately 3.5 months).
The precise duration of symptoms is the critical distinguishing factor among brief psychotic disorder, schizophreniform disorder, and schizophrenia.
4
Apply the temporal diagnostic criteria to the patient's presentation.
The duration of 14 weeks is greater than 1 month but less than 6 months.
Symptoms lasting <1 month indicate brief psychotic disorder, 1 to 6 months indicate schizophreniform disorder, and >6 months indicate schizophrenia.

Key Concept

Distinguishing brief psychotic disorder, schizophreniform disorder, and schizophrenia based strictly on the duration of clinical symptoms.
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Topics

Schizophrenia and Psychotic Disorders

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