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Difficulty: EasySchizophrenia and Psychotic Disorders

A 34-year-old woman is brought to the emergency department by her sister due to increasingly bizarre behavior. The sister reports that for the past 10 weeks, the patient has been locking herself in her room, claiming that foreign intelligence agents are monitoring her thoughts through the television. During the psychiatric interview, the patient is observed responding to unseen stimuli and her speech is frequently derailed. She has no prior psychiatric or medical history and takes no medications. 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 patient presents with an acute onset of prominent psychotic symptoms, including delusions (believing agents are monitoring her), auditory hallucinations (responding to unseen stimuli), and disorganized speech (derailment). These symptoms satisfy Criterion A for a schizophrenia spectrum diagnosis. The most critical distinguishing factor in this clinical scenario is the chronological timeline. Her symptoms have been present for 10 weeks (roughly 2.5 months). In the diagnostic spectrum of primary psychotic disorders, a duration of more than 1 month but less than 6 months is the defining hallmark of schizophreniform disorder. Because her toxicology screen is negative and there are no mood symptoms, other causes of psychosis are effectively ruled out.

Step-by-Step Solution

1
Identify the primary clinical syndrome.
The patient is experiencing an active psychotic episode characterized by delusions, hallucinations, and disorganized speech.
Establishing the presence of psychosis is the first step in formulating a differential diagnosis.
2
Determine the duration of the psychotic symptoms.
The patient's sister reports that the symptoms have been present for 10 weeks (approximately 2.5 months).
In primary psychotic disorders, symptom duration is the key distinguishing factor for diagnosis.
3
Exclude secondary causes and mood disorders.
Negative toxicology screen rules out substance-induced psychosis. Absence of mood symptoms rules out mood disorders with psychotic features and schizoaffective disorder.
Psychosis can be secondary to medical/substance issues or part of a primary mood disorder, which must be ruled out.
4
Apply DSM-5 duration criteria to isolate the correct primary psychotic disorder.
A duration of 10 weeks falls within the 1-month to 6-month window, pointing directly to schizophreniform disorder.
This confirms the diagnosis based on strict chronological criteria.

Key Concept

The differentiation of primary psychotic disorders (Brief Psychotic Disorder, Schizophreniform Disorder, Schizophrenia) relies primarily on the duration of symptoms.
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Topics

Schizophrenia and Psychotic Disorders

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