the frequency of personality disorders in patients with gender identity disorder

background :co-morbid psychiatric disorders affect prognosis, psychosocial adjustment and post-surgery satisfaction in patients with gender identity disorder. in this paper, we assessed the frequency of personality disorders in iranian gid patients.   methods : seventy- three patients requesting sex reassignment surgery (srs) were recruited for this cross- sectional study. of the participants, 57.5% were biologically male and 42.5% were biologically female. they were assessed through the millon clinical multiaxial inventory ii (mcmi- ii).   results : the frequency of personality disorders was 81.4%. the most frequent personality disorder was narcissistic personality disorder (57.1%) and the least was borderline personality disorder. the average number of diagnoses was 3.00 per patient.   conclusion : the findings of this study revealed that the prevalence of personality disorders was higher among the participants, and the most frequent personality disorder was narcissistic personality disorder (57.1%), and borderline personality disorder was less common among the studied patients.