Almost 10 years ago, clinicians at multiple locations all over Europe observed an increased number of antenatally undiagnosed cases of placenta accreta spectrum (PAS) resulting in significant morbidity and the occasional maternal death. Even with an improvement in antenatal imaging, the management of severe PAS remains challenging. One solution to improve understanding in rare but potentially lethal conditions is international collaboration. Consequently, a European working group was formed, which over the next few years grew into an international society, the IS-PAS. The collective goals are to develop a large shared database of cases, generate high-quality research into all aspects of PAS, and improve education of both healthcare professionals and patients. The first results of this collaboration are presented within this supplement.

Department of Experimental Obstetrics Charité Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt Universität zu Berlin and Berlin Institute of Health Berlin Germany

Department of Neuroscience Reproductive Sciences and Dentistry University of Naples Federico 2 Naples Italy

Department of Obstetrics and Gynecology 1st Faculty of Medicine Charles University and General University Hospital Prague Czech Republic

Department of Obstetrics and Gynecology Center Hospitalier Universitaire de Liège site CHR Citadelle Liège Belgium

Department of Obstetrics and Gynecology Fetomaternal Medical Center Helsinki University Hospital and University of Helsinki Helsinki Finland

Department of Obstetrics Charité Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt Universität zu Berlin and Berlin Institute of Health Berlin Germany

Fetal Medicine Unit John Radcliffe Hospital Oxford UK

Nuffield Department of Women's and Reproductive Health University of Oxford Oxford UK

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