A 34-year-old female presents to a counselor at the urging of her parents because they are concerned that she might be depressed. After recently breaking up with her long-term boyfriend, she moved back in with her parents because she could not handle making decisions alone. Soon after their breakup, she started going on 5–7 dates a week. She has been unemployed for 3 years, as her boyfriend took care of all the bills. In the past year, she thought of looking for a job but never felt confident enough to start the process. Her mom arranges her doctor's appointments and handles her car maintenance. She describes feeling uneasy when she is alone. She has hypothyroidism treated with levothyroxine. She does not smoke or drink alcohol. Vital signs are normal. Mental status exam shows a neutral affect. Neurologic examination shows no focal findings. Which of the following is the most likely diagnosis?

Borderline personality disorder

A 12-year-old boy is brought in by his parents as they are concerned about his behavior. He is constantly arguing with his parents and blatantly defying their every request. In school, he is known for being intentionally tardy and for defying his teachers. Upon further questioning of the patient you learn about some of his recent behaviors such as beginning smoking to bother his parents. You also notice that he is disrespectful towards you. You then learn that he has also gotten into weekly fights with his peers at school with no apparent cause. In addition, last week he was seen hitting one of the local neighborhood cats with a baseball bat trying to kill it. The patient lives at home with his two parents in a pre-World War II house that was recently renovated. Physical exam is unremarkable. Laboratory values are as follows: Na: 140 mmol/L K: 4.5 mmol/L Cl: 100 mmol/L Glucose: 80 mg/dL Ca: 10 mmol/L Mg: 3 mEq/L Cr: 0.8 mg/dL BUN: 10 mg/dL Serum lead: < .01 µg/dL Hb: 15 g/dL Hct: 45% MCV: 95 Urine toxicology: negative As the patient leaves the office you notice him stealing all of the candy from the office candy bowl. The patient seems unconcerned about his behavior overall. Which of the following statements is most likely to be true in this patient?

The patient's symptoms could progress to antisocial personality disorder

This patient will likely function normally despite continuing to defy authority figures

Environmental exposures are likely causing this patient's behavior

This patient is suffering from antisocial personality disorder and will likely be incarcerated in adulthood

Strong D2 antagonists are first-line pharmacotherapy

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 29-year-old woman presents with convulsions. The patient’s brother says that he found her like that an hour ago and immediately called an ambulance. He also says that she has been extremely distraught and receiving supportive care from a social worker following a sexual assault by a coworker a few days ago. He says that the patient has no history of seizures. She has no significant past medical history and takes no medications. The patient’s vital signs include: temperature 37.0°C (98.6°F), pulse 101/min, blood pressure 135/99 mm Hg, and respiratory rate 25/min. On physical examination, the patient is rolling from side to side, arrhythmically thrashing around, and muttering strangely. Her eyes are closed, and there is resistance to opening them. Which of the following is the most likely diagnosis in this patient?

Functional neurological symptom disorder (Conversion disorder)

Somatic symptom disorder with predominant pain

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

Histrionic personality disorder for USMLE Step 1: High-Yield Psychiatry Lessons

HPD Overview - The Drama Queen

A Cluster B personality disorder characterized by a pervasive pattern of excessive emotionality and attention-seeking behavior, beginning by early adulthood.
Core features include inappropriate seductive behavior, using physical appearance to draw attention, and theatricality.
Epidemiology:
- Prevalence: ~2% of the general population.
- More frequently diagnosed in women.

⭐ Patients with HPD often have a higher risk of suicidal gestures and threats, which are typically manipulative in intent rather than a genuine desire to die.

Clinical Features - Center Stage

A pervasive pattern of excessive emotionality and attention-seeking, beginning by early adulthood. Diagnosis requires ≥5 of the following criteria:

📌 Mnemonic: PRAISE ME

Provocative or seductive behavior.
Relationships are considered more intimate than they actually are.
Attention: uncomfortable when not the center of attention.
Influenced easily by others or circumstances.
Speech is impressionistic and lacks detail.
Emotions are rapidly shifting and shallow.
Made up: uses physical appearance to draw attention.
Emotions are exaggerated (theatrical).

Histrionic Personality Disorder: Diagnostic Criteria

⭐ High-Yield: Patients with HPD often have co-occurring somatic symptom disorder and conversion disorder. They may present with dramatic, vague, and exaggerated physical complaints.

Differential Diagnosis - Separating the Stars

Differentiating HPD from other Cluster B disorders is key. The core motivation behind the behavior is the main clue.

Disorder	Core Feature	Motivation	Interpersonal Style
Histrionic	Pervasive attention-seeking	Wants to be the center of attention	Theatrical, charming, but emotionally shallow
Borderline	Instability (mood, self-image, relationships)	Fear of abandonment	Intense, stormy relationships; splitting
Narcissistic	Grandiosity, need for admiration	Seeks admiration and validation of superiority	Exploitative, lacks empathy, entitled

Management - Guiding the Performance

Psychotherapy is the cornerstone of treatment, aiming to improve insight and interpersonal skills.
- Psychodynamic Therapy: Explores unconscious motivations behind dramatic behaviors.
- Supportive Therapy: Focuses on improving self-esteem and coping mechanisms.
Key Therapeutic Challenges:
- Maintaining firm professional boundaries is critical.
- Managing intense transference (patient projects feelings onto therapist) and countertransference (therapist's reaction).
Pharmacotherapy: No medications are specific to HPD. Used to treat comorbid conditions like depression or anxiety (e.g., SSRIs).

⭐ Patients often challenge therapeutic boundaries with dramatic crises or seductive behavior. A consistent, non-punitive limit-setting approach is essential for a stable therapeutic alliance.

High‑Yield Points - ⚡ Biggest Takeaways

Core features are excessive emotionality and attention-seeking behavior, beginning in early adulthood.

Often inappropriately seductive or provocative in interactions.

Displays rapidly shifting and shallow expression of emotions.

Speech is impressionistic and lacks in detail; e.g., “He’s a wonderful person.”

Consistently uses physical appearance to draw attention to self.

Considers relationships to be more intimate than they actually are.

Associated with Cluster B personality disorders.

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