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Difficulty: EasyPersonality Disorders

A 25-year-old man is brought to the outpatient clinic by his sister, who is concerned about his profound social isolation. For the past 6 years, the patient has lived alone and worked as a night-shift security guard specifically to avoid interacting with others. He reports that he prefers to be alone because he feels "uncomfortable and suspicious" around people, believing they are secretly judging his aura. He has a long-standing belief in telepathy and claims he can occasionally predict the future through his dreams, although he denies ever hearing voices or seeing things that are not there. During the interview, he displays restricted affect and wears a heavy winter coat lined with aluminum foil, despite it being a warm summer day. His speech is vague and overly elaborate but remains logically connected. He has never been hospitalized and has maintained his employment. Which of the following is the most likely diagnosis?

  1. Schizotypal personality disorderAnswer
  2. B
    Schizophrenia
  3. C
    Schizophreniform disorder
  4. D
    Brief psychotic disorder
  5. E
    Delusional disorder

Answer

Schizotypal personality disorder
The correct diagnosis is Schizotypal personality disorder. This condition is a Cluster A (odd/eccentric) personality disorder characterized by a pervasive pattern of social and interpersonal deficits, marked by acute discomfort with close relationships, as well as cognitive or perceptual distortions and eccentricities of behavior. This patient's magical thinking (telepathy, predicting the future), odd appearance (foil-lined coat), suspiciousness, and social anxiety are classic features. Crucially, while these patients exhibit odd thoughts, they do not experience frank hallucinations or true fixed delusions, separating their condition from schizophrenia.

Step-by-Step Solution

1
Analyze the patient's presenting symptoms and timeline.
The patient has a 6-year history of social isolation, odd beliefs (telepathy, predicting the future), suspiciousness, and eccentric appearance (foil-lined coat).
Identifying the nature and chronicity of the symptoms is required to differentiate between personality disorders and acute psychotic illnesses.
2
Evaluate for the presence of frank psychotic symptoms.
The patient explicitly denies auditory or visual hallucinations and does not have fixed, false delusions (his thoughts are odd and magical, but do not meet the threshold for frank psychosis).
The absence of active-phase psychotic symptoms rules out primary psychotic disorders like schizophrenia or schizophreniform disorder.
3
Synthesize the findings to formulate a diagnosis.
A chronic, lifelong pattern of acute discomfort in close relationships, cognitive or perceptual distortions (magical thinking), and eccentricities of behavior points directly to a Cluster A personality disorder.
Schizotypal personality disorder perfectly encompasses the combination of odd behavior, magical thinking, and interpersonal deficits present in this patient.

Key Concept

Schizotypal personality disorder is characterized by a lifelong pattern of social and interpersonal deficits, cognitive or perceptual distortions (such as magical thinking and odd beliefs), and eccentric behavior, without the frank delusions or hallucinations seen in schizophrenia.
Estimated Time:1m 0s
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Topics

Personality Disorders

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