Placenta accreta spectrum (PAS) is a condition of abnormal placental invasion including placenta accreta, increta and percreta and is a major cause of maternal morbidity and mortality. Recently, a conservative surgical technique has been proposed as a valid alternative to peri-partum hysterectomy to reduce the short- and long-term risks for the mothers and to preserve fertility. Magnetic resonance imaging (MRI) seems to be useful first of all at the time of diagnosis and furthermore to investigate the course of conservative management of PAS. We describe three cases of PAS treated with conservative procedure and managed with clinic, ultrasound and MRI by a multidisciplinary equipe.