A 19-year-old woman comes to the physician because of a 2-day history of difficulty sleeping. She worries that the lack of sleep will ruin her career prospects as a model. She has been coming to the physician multiple times over the past year for minor problems. She is dressed very extravagantly and flirts with the receptionist. When she is asked to sit down in the waiting room, she begins to cry and says that no one listens to her. When she is called to the examination room, she moves close to the physician, repeatedly intends to touch his cheek, and makes inappropriate comments. She does not have a history of self-harm or suicidal ideation. Which of the following is the most likely diagnosis?

Histrionic personality disorder

Schizotypal personality disorder

Borderline personality disorder

Narcissistic personality disorder

A 28-year-old woman is brought to a counselor by her father after he found out that she is being physically abused by her husband. The father reports that she refuses to end the relationship with her husband despite the physical abuse. She says that she feels uneasy when her husband is not around. She adds, “I'm worried that if I leave him, my life will only get worse.” She has never been employed since they got married because she is convinced that nobody would hire her. Her husband takes care of most household errands and pays all of the bills. Physical examination shows several bruises on the thighs and back. Which of the following is the most likely diagnosis?

Borderline personality disorder

A 35-year-old woman presents to clinic in emotional distress. She states she has been unhappy for the past couple of months and is having problems with her sleep and appetite. Additionally, she reports significant anxiety regarding thoughts of dirtiness around the house. She states that she cleans all of the doorknobs 5-10 times per day and that, despite her actions, the stress related to cleaning is becoming worse. What is this patient's diagnosis?

Obsessive compulsive disorder (OCD)

Generalized anxiety disorder (GAD)

Obsessive compulsive personality disorder (OCPD)

A 10-year-old boy is brought to the physician by his parents because they are concerned about his “strange behavior”. The parents state that he has always been a lonely kid without many friends, but recently he has been having behavioral problems that seem to be unprovoked and are occurring more frequently. The child throws tantrums for no reason and does not respond to punishment or reward. He also has a “strange obsession” with collecting rocks that he finds on his way to and from school to the point where his room is filled with rocks. He plays alone in his room, lining the rocks up, organizing them by size, shape, or color, and he will randomly bark or make high-pitched noises without provocation. His teachers say he daydreams a lot and is very good at art, being able to recreate his favorite cartoon characters in great detail. On physical assessment, the patient does not make eye contact with the physician but talks incessantly about his rock collection. The child’s grammar and vocabulary seem normal but his speech is slightly labored, and he can’t seem to tell that the physician is not really interested in hearing about his rock collection. Which of the following is the most likely diagnosis?

Attention deficit hyperactivity disorder

A 33-year-old man with documented antisocial personality disorder and substance use disorder is convicted of assault. The defense attorney requests psychiatric testimony that the defendant's personality disorder diminished his capacity to conform his conduct to the law. His history includes multiple prior convictions, repeated lying, failure to sustain employment, lack of remorse, and disregard for others' safety. However, he understood the wrongfulness of his actions and planned the assault in advance. Evaluate the relationship between antisocial personality disorder and criminal responsibility.

Antisocial personality disorder does not meet criteria for insanity defense as patients retain capacity to understand wrongfulness

Chronic pattern of behavior demonstrates inability to conform conduct to law

Combination of personality disorder and substance use negates criminal responsibility

Comorbid substance use disorder supports insanity defense

Personality disorders qualify for diminished capacity due to impaired impulse control

A 26-year-old woman presents requesting cosmetic surgery consultation. She is preoccupied with achieving the 'perfect' appearance, has undergone multiple procedures, and expresses disappointment with each result. She describes herself as special and destined for greatness, becomes enraged when her primary care physician suggested psychiatric evaluation, and states she will report him for 'not understanding her needs.' She expects special treatment in the clinic and becomes irritated when kept waiting. On mental status exam, she shows intact reality testing. Analyze the most likely underlying personality structure.

Narcissistic personality disorder with difficulty tolerating narcissistic injury

Histrionic personality disorder with attention-seeking behavior

Obsessive-compulsive personality disorder with perfectionism

Borderline personality disorder with identity disturbance

Body dysmorphic disorder with poor insight

Obsessive-compulsive personality disorder for USMLE Step 3: High-Yield Psychiatry Lessons

OCPD Basics - The Perfectionist's Playbook

A pervasive pattern of preoccupation with orderliness, perfectionism, and mental/interpersonal control, at the expense of flexibility, openness, and efficiency.
Ego-syntonic: Individuals perceive their traits as normal and desirable, unlike the ego-dystonic nature of OCD where obsessions are distressing.
Prevalence is estimated at 2.1-7.9% in the general population. Common comorbidities include anxiety disorders and depression.

⭐ High-Yield: Unlike OCD, OCPD lacks true obsessions or compulsions. The focus is on a rigid, lifelong pattern of perfectionism and control.

Head silhouette with tangled lines

Diagnosis (DSM-5) - Rigidity Rules

A pervasive pattern of preoccupation with orderliness, perfectionism, and mental/interpersonal control, at the expense of flexibility, openness, and efficiency. Requires ≥4 of the following:

Preoccupied with details/rules: Loses the major point of the activity.
Perfectionism: Interferes with task completion.
Workaholic: Excessively devoted to work, excluding leisure/friendships.
Inflexible: Overconscientious and scrupulous about morality, ethics, or values.
Hoarding: Unable to discard worthless objects without sentimental value.
Reluctant to delegate: Demands others conform to their exact methods.
Miserly: Hoards money for future catastrophes.
Rigid and stubborn.

📌 Mnemonic: LAW FIRMS (Loses point, Ability to delegate lost, Workaholic, Frugal, Inflexible, Rigid, Miserly, Stubborn)

⭐ OCPD is ego-syntonic (patients view their behavior as correct), unlike OCD, which is ego-dystonic (patients are distressed by their obsessions/compulsions).

Differential Diagnosis - OCPD vs. The World

Feature	OCPD	Obsessive-Compulsive Disorder (OCD)
Nature	Ego-syntonic (views traits as desirable)	Ego-dystonic (distressed by symptoms)
Core Feature	Pervasive preoccupation with order, perfectionism, control	True obsessions and/or compulsions
Insight	Poor; sees no issue with behavior	Good; recognizes irrationality

Narcissistic PD: Perfectionism aims for admiration, not adherence to rigid, self-imposed standards.
Avoidant PD: Social withdrawal is due to fear of inadequacy, not devotion to work.

Management - Easing the Grip

Psychotherapy: Cornerstone of treatment. Aims to increase flexibility and reduce perfectionism.
- Cognitive-behavioral therapy (CBT): Helps patients identify and challenge rigid thought patterns and compulsive behaviors.
- Psychodynamic therapy: Explores unconscious conflicts and developmental roots of OCPD traits.
Pharmacotherapy: No FDA-approved drugs specifically for OCPD. Used adjunctively for severe symptoms or comorbidities.
- SSRIs (e.g., fluoxetine) can help reduce rigidity, anxiety, and depressive symptoms.

⭐ Patients with OCPD are typically ego-syntonic; they do not view their traits as problematic, which can make initiating and maintaining therapy challenging.

High‑Yield Points - ⚡ Biggest Takeaways

A pervasive pattern of preoccupation with orderliness, perfectionism, and control, at the expense of flexibility.

Crucially, OCPD is ego-syntonic (patients see no issue), unlike the ego-dystonic nature of OCD.

Characterized by excessive devotion to work, indecisiveness, rigidity, and a reluctance to delegate.

Often associated with miserly spending habits and hoarding of worthless items.

A Cluster C (anxious, fearful) personality disorder.

Psychotherapy is the primary treatment modality.

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