Sadistic personality disorder was a personality disorder diagnosis involving sadism which appeared only in an appendix of the revised third edition of the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (DSM-III-R),Hucker, Stephen J. Sadistic Personality Disorder The version of the DSM (DSM-IV) does not include it, nor does the most recent version DSM-5 so it is no longer considered a valid diagnostic category.