A 22-year-old woman is brought to the emergency room after making superficial cuts on her wrist following an intense argument with her boyfriend. She has a history of highly unstable and intense relationships, alternating between idealizing and devaluing partners. She describes a chronic feeling of emptiness, impulsivity in spending and sexual behavior, and recurrent suicidal gestures. She often struggles with her sense of self and identity. Which of the following is the most likely diagnosis?

Explanation

The patient's presentation is classic for Borderline Personality Disorder (Cluster B). Key features include frantic efforts to avoid real or imagined abandonment, a pattern of unstable and intense interpersonal relationships characterized by alternating between extremes of idealization and devaluation, identity disturbance, impulsivity in at least two areas that are potentially self-damaging (e.g., spending, sex, substance abuse, reckless driving, binge eating), recurrent suicidal behavior or gestures or self-mutilating behavior, affective instability due to marked reactivity of mood, chronic feelings of emptiness, inappropriate intense anger, and transient, stress-related paranoid ideation or severe dissociative symptoms. All these features are strongly suggested in the vignette. Histrionic Personality Disorder (A) is characterized by excessive emotionality and attention-seeking behavior. Narcissistic Personality Disorder (B) involves a pervasive pattern of grandiosity, a need for admiration, and a lack of empathy. Antisocial Personality Disorder (D) is characterized by a pervasive pattern of disregard for and violation of the rights of others, typically beginning in childhood or early adolescence and continuing into adulthood. While impulsivity and disregard for consequences can overlap, the emotional dysregulation, identity disturbance, and fear of abandonment are more central to Borderline PD.