Vulnerabilidade cumulatiVa: estudo de um caso de Violência doméstica, toxicodependência e GraVidez na adolescência Vulnerabilidad acumulada: estudio de un caso de Violencia doméstica, droGadicción y el embarazo en la adolescencia 1 phd student in clinical psychology at the institute of psychology, university of sao paulo, sao paulo, brazil. 2 master's degree in clinical psychology from the institute of psychology, university of sao paulo, sao paulo, brazil. 3 master's student in clinical psychology at the institute of psychology,university of sao paulo, sao paulo, brazil. 4 professor at the school of psychology and educational sciences, university of coimbra, and researcher at the center for social studies, university of coimbra, coimbra, portugal. 5 associate professor at the institute of psychology, university of sao paulo, sao paulo, brazil. 6 professor in the undergraduate program in obstetrics at the school of arts, sciences and Humanities, university of sao paulo, sao paulo, brazil.