Preoperative sonographic staging in patients with suspected parametrial endometriosis is essential to plan surgical intervention and anticipate the need for a multidisciplinary approach, and thus optimize surgical outcome. The results of a recent meta-analysis suggest that there is a need to define more accurately the ultrasonographic criteria for parametrial involvement in endometriosis. This addendum to the International Deep Endometriosis Analysis (IDEA) consensus highlights the sonographic characteristics of the parametrium and identifies ultrasound techniques to diagnose deep endometriosis in this area. © 2023 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.

Academic Unit of Obstetrics and Gynecology IRCCS Ospedale Policlinico San Martino Genoa Italy

Acute Gynaecology Early Pregnancy and Advanced Endoscopy Surgery Unit Sydney Medical School Nepean Nepean Hospital University of Sydney Penrith NSW Australia

Centro Integrato di Procreazione Medicalmente Assistita e Diagnostica Ostetrico Ginecologica Azienda Ospedaliero Universitaria Cagliari Policlinico Duilio Casula Monserrato Italy

Centro Integrato di Procreazione Medicalmente Assistita e Diagnostica Ostetrico Ginecologica Azienda Ospedaliero Universitaria Policlinico Duilio Casula Monserrato Italy

Department of Development and Regeneration KU Leuven Leuven Belgium

Department of Gynecology Center for Endometriosis Hospital St John of God Vienna Austria

Department of Medicine and Surgery Unit of Surgical Science Obstetrics and Gynecology University of Parma Parma Italy

Department of Neurosciences Rehabilitation Ophthalmology Genetics Maternal and Child Health University of Genoa Genoa Italy

Department of Obstetrics and Gynaecology Faculty of Medicine Semmelweis University Budapest Hungary

Department of Obstetrics and Gynaecology Leuven University Fertility Centre University Hospitals Leuven Leuven Belgium

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

Department of Obstetrics and Gynecology KU Leuven University Hospital Leuven Belgium

Department of Obstetrics and Gynecology School of Medicine Universidad de Navarra Pamplona Spain

Department of Obstetrics and Gynecology The Ottawa Hospital Ottawa ON Canada

Dipartimento Scienze della Salute della Donna del Bambino e di Sanità Pubblica Fondazione Policlinico Universitario A Gemelli IRCCS Rome Italy

Dipartimento Scienze della Vita e Sanità Pubblica Università Cattolica del Sacro Cuore Rome Italy

Disciplina de Ginecologia Departamento de Obstetricia e Ginecologia Hospital das Clinicas da Faculdade de Medicina da Universidade de São Paulo São Paulo Brazil

Endoscopica Malzoni Center for Advanced Pelvic Surgery Avellino Italy

Gynecologic Division BP A Beneficencia Portuguesa de São Paulo São Paulo Brazil

Queen Charlotte's and Chelsea Hospital Imperial College London London UK

Rudolfinerhaus Private Clinic and Campus Vienna Austria

University of Cagliari Cagliari Italy

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