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Question

Difficulty: MediumPersonality Disorders

A 38-year-old man, a self-employed clock repairman, presents to a primary care clinic for a physical examination required to renew his commercial driver's license. He has not interacted with the healthcare system in over a decade. During the interview, the patient is guarded and reluctant to answer questions regarding his medical history. When asked about his living situation, he becomes irritable, demanding to know why the physician is "prying into my personal life" and questioning whether the clinic intends to share his information with government agencies to revoke his license. The patient's brother, who is in the waiting room, privately informs the nurse that the patient has always been "highly suspicious" of others since his early twenties. The brother notes that the patient frequently accuses his clients of trying to defraud him and has completely cut off contact with several family members because he suspects they are secretly plotting to ruin his business. The patient has never experienced hallucinations, his speech is goal-directed and organized, and he does not hold magical or bizarre beliefs. Which of the following is the most likely diagnosis?

  1. Paranoid personality disorderAnswer
  2. B
    Delusional disorder
  3. C
    Schizophreniform disorder
  4. D
    Schizotypal personality disorder
  5. E
    Schizoid personality disorder

Answer

Paranoid personality disorder
The correct answer is paranoid personality disorder. This condition is characterized by a pervasive and long-standing pattern of distrust and suspiciousness of others. Patients frequently interpret the motives of others as malevolent, bear grudges, and suspect that others are exploiting or deceiving them without sufficient basis. This patient's lifelong history (since his early twenties) of suspecting government agencies, clients, and family members of plotting against him perfectly aligns with this diagnosis. Crucially, he does not exhibit fixed, bizarre delusions or hallucinations, which distinguishes his condition from primary psychotic disorders.

Step-by-Step Solution

1
Analyze the patient's primary symptoms and their duration.
The patient exhibits pervasive distrust and suspiciousness across multiple contexts (clinic, clients, family) starting in early adulthood.
Establishing the core symptom cluster and its timeline differentiates personality disorders from acute psychotic episodes.
2
Evaluate for the presence of true psychotic features.
There are no hallucinations, disorganized speech, magical thinking, or fixed delusions localized to a single false belief.
The absence of these features rules out primary psychotic disorders like schizophrenia or delusional disorder.
3
Differentiate among Cluster A personality disorders.
The primary presentation is active suspicion and distrust, rather than emotional detachment (schizoid) or odd, magical beliefs (schizotypal).
Cluster A disorders share a genetic relationship with schizophrenia but have distinct clinical presentations.

Key Concept

Paranoid personality disorder is characterized by a pervasive, lifelong pattern of distrust and suspiciousness of others, interpreting their motives as malevolent, without the presence of fixed delusions or other psychotic features.
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Topics

Personality Disorders

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