Background: Placenta accreta is defined as abnormal trophoblast invasion of part or all of the placenta into the myometrium of the uterine wall. Placenta accreta spectrum, formerly known as morbidly adherent placenta, refers to the range of pathologic adherence of the placenta, including placenta increta, placenta percreta, and placenta accreta. Maternal morbidity and mortality can occur because of severe and sometimes life-threatening hemorrhage, which often requires blood transfusion. Rates of maternal death are increased for women with placenta accreta spectrum. Objective: The purpose of this review was to highlight diagnosis by magnetic resonance imaging (MRI) and ultrasonographic of the presence of placenta accreta spectrum (PAS). Methods: These databases were searched for articles published in English in 3 data bases [PubMed – Google scholar- science direct] and Boolean operators (AND, OR, NOT) had been used such as [Diagnosis of Placenta Accreta and Placenta Accreta Spectrum OR PAS] and in peer-reviewed articles between June 2005 and February 2021. Documents in a language apart from English have been excluded as sources for interpretation was not found. Papers apart from main scientific studies had been excluded: documents unavailable as total written text, conversation, conference abstract papers and dissertations. Conclusion: The timely diagnosis of abnormal placentation is of great importance since, the earliest diagnosis implies less risky, less costly and successful management. Ultrasonography may successfully achieve this goal. Furthermore, MRI imaging, in cases of diagnostic dilemmas may be particularly useful and lead to safer and more precise diagnosis.