[Nosological concepts of borderline disorders].

In spite of its frequent use the diagnostic label "borderline disorder" is still not conceptualized in a unified way. The contemporary borderline concepts are presented and discussed, especially borderline disorder as a form of schizophrenia, borderline disorder as a special type of personality disorder in the sense of the DSM-III, borderline disorder in the sense of an encompassing borderline personality organization, and borderline disorder as a form of an affective disorder. Using this concept, it is always necessary to specify its precise meaning.