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Difficulty: HardSchizophrenia and Psychotic Disorders

A 21-year-old college junior is brought to the student health clinic by his roommate. The roommate reports that for the past 6 weeks, the patient has been behaving unusually, such as wrapping his laptop in aluminum foil and claiming that foreign intelligence agents are tracking his brainwaves. During the interview, the patient appears visibly guarded, avoids eye contact, and frequently pauses mid-sentence as if listening to an unseen presence. When contacted, the patient's parents state that he was an outgoing and high-achieving student until approximately 8 months ago. At that time, he abruptly quit the university track team, withdrew from social activities, and began speaking in a monotonous tone with minimal facial expressivity. The parents note his sleep and appetite have remained normal, and he has consistently denied feeling sad or hopeless. A comprehensive metabolic panel and a urine toxicology screen show no abnormalities. Which of the following is the most likely diagnosis?

  1. SchizophreniaAnswer
  2. B
    Schizophreniform disorder
  3. C
    Brief psychotic disorder
  4. D
    Major depressive disorder with psychotic features
  5. E
    Schizotypal personality disorder

Answer

Schizophrenia
The correct diagnosis is schizophrenia. The diagnostic criteria for schizophrenia require the continuous signs of the disturbance to persist for at least 6 months. This 6-month period must include at least 1 month of active-phase symptoms (delusions, hallucinations, disorganized speech, disorganized behavior, or negative symptoms) and may include periods of prodromal or residual symptoms. In this vignette, the patient has experienced active positive symptoms (delusions of being tracked, auditory hallucinations) for 6 weeks. However, his illness began 8 months ago with an abrupt decline in functioning and the onset of prominent negative symptoms (social withdrawal, alogia, flat affect). Because the total duration of his illness (prodromal phase plus active phase) is 8 months, he meets the criteria for schizophrenia.

Step-by-Step Solution

1
Identify the active psychotic symptoms and their duration.
The patient has experienced delusions of persecution and likely auditory hallucinations for the past 6 weeks.
This establishes the presence of an active psychotic phase lasting at least 1 month, fulfilling Criterion A for schizophrenia spectrum disorders.
2
Identify any preceding prodromal symptoms and calculate the total duration of illness.
The patient exhibited social withdrawal, monotonous speech (alogia), and minimal facial expressivity (flat affect) starting 8 months ago.
DSM-5 criteria require counting prodromal, active, and residual phases toward the total duration of the disturbance.
3
Compare the total illness duration against diagnostic timeline criteria.
The total duration is 8 months. Schizophreniform disorder requires a duration of 1 to 6 months, whereas schizophrenia requires a duration of greater than 6 months.
Because the continuous signs of the disturbance exceed 6 months, the correct diagnosis is schizophrenia.

Key Concept

The diagnosis of schizophrenia requires continuous signs of the disturbance (including prodromal, active, and residual phases) for at least 6 months, whereas schizophreniform disorder is diagnosed when the total duration is between 1 and 6 months.
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Topics

Schizophrenia and Psychotic Disorders

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