A 16-year-old boy is brought to therapy by his parents due to his frequent misbehavior. Over the last year, he has been known to lie frequently, intentionally destroy property, and has been involved in several physical fights. When confronted, he shows no remorse and blames his friends for his actions. What is the most likely diagnosis?

A 32-year-old man was recently admitted to the hospital after a week-long episode of elevated mood and irritability. During this time, he impulsively spent his life savings, gambled recklessly, and reported needing only 2 hours of sleep per night. His wife also noted that he was talking rapidly and that his thoughts were "racing." What is the most likely diagnosis?

A 25-year-old man has a pervasive pattern of social and interpersonal deficits. He has few close friends, believes he has a "sixth sense" about the future, and feels uncomfortable in social situations. Others describe him as having an eccentric or odd affect, but he does not report any hallucinations or delusions. What is the most likely diagnosis?

A 4-year-old boy has significant difficulty with social-emotional reciprocity, rarely initiating or responding to social overtures from his parents. He insists on following the exact same routine every day and becomes very distressed by minor changes. He also shows intense, focused interests in specific objects and engages in repetitive hand-flapping behaviors. What is the most likely diagnosis?

A 19-year-old female presents with a significantly low body weight (BMI 16.5). She expresses an intense fear of gaining weight and denies the seriousness of her current low body weight. She reports regularly engaging in self-induced vomiting after consuming small amounts of food. This behavior has occurred frequently over the last three months. What is the most likely diagnosis?

Scenario: A 42-year-old man reports a history of experiencing multiple, recurrent panic attacks. These attacks are typically unexpected and involve palpitations, sweating, and feelings of unreality. For the past month, he has been constantly worried about having another panic attack and is now avoiding public places, such as malls and theaters, because he is afraid he won't be able to escape if another attack occurs.

Scenario: For the past year, a 38-year-old woman has been preoccupied with the belief that a specific part of her body is flawed. Specifically, she is certain that her nose is too large and misshapen, even though others see it as a normal nose. This preoccupation leads her to spend several hours a day checking her reflection and avoiding social situations. She is not significantly underweight.

Scenario: For several weeks, a 24-year-old man has been tormented by repetitive, intrusive thoughts that he is going to harm his family. He knows these thoughts are irrational and unwanted, but he cannot stop them. To cope, he engages in specific mental rituals, such as counting to 100 in his head and replaying his family's positive memories, believing this will prevent him from acting on his urges. What is the most likely diagnosis for this patient?

A 45-year-old man consistently fails to conform to social norms and lawful behaviors. He has a history of repeated lying, conning others for personal profit, and aggressive behavior towards others. He shows no remorse for his actions and demonstrates a persistent pattern of irresponsibility, having a history of failing to hold down a job or pay his bills. His history indicates a pattern of misconduct beginning before age 15. Which disorder best fits this scenario?

A 20-year-old woman recently witnessed a serious car accident. Afterward, she found herself completely unable to recall any of the events immediately surrounding the crash. She reports feeling as though she has lost time and doesn't know how she got home, and this memory loss is not due to a head injury or substance use. What is the most likely diagnosis?

A 35-year-old individual reports a pervasive pattern of grandiosity, a need for excessive admiration, and a lack of empathy. They believe they are "special" and can only be understood by high-status people. They have a sense of entitlement and frequently exploit others to achieve their own goals, showing arrogant and haughty behaviors. Which personality disorder best fits this description?

Scenario: For the past six months, a 15-year-old girl has consistently been passing urine in her bed and clothes, both during the day and at night. This is causing significant embarrassment and distress, but she insists that she doesn't do it on purpose. Her doctor has ruled out any physical causes. What is the most likely diagnosis?

Scenario: A 28-year-old man exhibits a pervasive pattern of social and interpersonal deficits. He has few, if any, close friends or confidants other than a first-degree relative. He appears indifferent to the praise or criticism of others and displays a flattened range of emotions. He prefers solitary activities and reports little interest in sexual experiences. What is the most likely diagnosis?

A patient presents with a history of multiple hospitalizations for fabricated and self-induced illnesses, such as fevers and gastrointestinal issues, with no apparent external incentives for her behavior. What is the most likely diagnosis?

A 28-year-old woman is persistently uncomfortable when she is not the center of attention. She is overly dramatic, uses her physical appearance to draw attention, and her speech is impressionistic and lacks detail. She considers her relationships more intimate than they are. Which personality disorder best fits this description?

Scenario: A 25-year-old man consistently and persistently misinterprets the motives and actions of others as being malevolent and suspicious. He is preoccupied with unjustified doubts about the loyalty of his friends and associates and is reluctant to confide in others for fear that the information will be used against him.

Scenario: A 10-year-old boy is brought to the clinic because for the past 4 months, he has been repeatedly and intentionally setting fires, causing property damage. He reports feeling a sense of tension and arousal before the act and experiencing relief and gratification afterward. He shows no remorse for his actions and has no history of conduct disorder.

Scenario: For the past 6 months, a 30-year-old man has experienced a period of extreme sadness, loss of interest, and feelings of worthlessness for at least 2 weeks. Before this, he had a period of elevated or irritable mood that lasted for only three days. During this time, he was more talkative, energetic, and his thoughts were racing, but it did not cause significant impairment in his functioning.

A 40-year-old woman was admitted to the hospital and began experiencing fevers and a skin rash. She requested a large number of tests and procedures. Her doctor discovered that she had been intentionally injecting herself with fecal matter to cause the infection. Her sister, who has a dependent personality, is always with her and is treated as an extension of the woman. What is the most likely diagnosis?

A 35-year-old man frequently has episodes where he cannot resist the impulse to steal low-value items from stores, even though he does not need them. He feels a building sense of tension before the act and relief or gratification after. He feels shame and guilt but cannot stop. What is the most likely diagnosis?

A 16-year-old girl is admitted to the hospital with a dangerously low body weight (BMI below 17). She expresses an intense fear of gaining weight and a distorted perception of her body size, believing she is fat even though she is emaciated. She restricts her food intake and exercises excessively. What is the most likely diagnosis?

A 45-year-old woman works as a veterinarian but has a crippling fear of spiders. Whenever she sees a spider, she experiences an immediate and intense physical and emotional reaction, including a pounding heart, shortness of breath, and a compelling urge to run away. This fear is excessive and has been present for years, but she has developed successful avoidance strategies that prevent it from interfering with her work. What is the most likely diagnosis?

A 17-year-old high school student avoids speaking in his health class because he is terrified that his classmates will judge his answers. He worries for days before a presentation and experiences a pounding heart, shaking, and sweating during social interactions. He is outgoing and talkative with close friends and family but avoids any public speaking or social gathering with unfamiliar people. What is the most likely diagnosis?

A 40-year-old woman reports that during the week leading up to her menstrual period, she consistently experiences severe depressive mood, irritability, and anxiety. She also has breast tenderness, joint pain, and feelings of being overwhelmed. Her symptoms resolve completely within a few days after the onset of her period. What is the most likely diagnosis?

Every winter, a 30-year-old man experiences a predictable episode of low mood, increased appetite, and a strong craving for carbohydrates. He feels sluggish and sleeps more than usual. These symptoms start in the late fall, worsen throughout the winter, and resolve completely by spring. This has occurred for the past 3 consecutive years. What is the most likely diagnosis?

A 14-year-old girl, for the past 8 months, has been experiencing a low-grade depressive mood for most of the day, nearly every day. She has also had low energy, low self-esteem, and difficulty concentrating. Although she has periods where she feels okay, she has never been symptom-free for more than a month or two. She has never experienced a full major depressive episode. What is the most likely diagnosis?