Acute colonic diverticulitis is one of the most common clinical conditions encountered by surgeons in the acute setting. An international multidisciplinary panel of experts from the World Society of Emergency Surgery (WSES) updated its guidelines for management of acute left-sided colonic diverticulitis (ALCD) according to the most recent available literature. The update includes recent changes introduced in the management of ALCD. The new update has been further integrated with advances in acute right-sided colonic diverticulitis (ARCD) that is more common than ALCD in select regions of the world.

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

2nd Department of Surgery Aretaieion University Hospital National and Kapodistrian University of Athens Athens Greece

Abdominal Center University Hospital Meilahti Helsinki Finland

Clinic for Emergency Surgery Medical Faculty University of Belgrade Belgrade Serbia

Colorectal Unit Addenbrooke's Hospital Cambridge University Hospitals NHS Foundation Trust Cambridge UK

Department General Surgery Kipshidze Central University Hospital Tbilisi Georgia

Department of Aeromedical Services for Emergency and Trauma Care Ehime University Graduate School of Medicine Ehime Japan

Department of Digestive Surgery Guastalla Hospital Reggio Emilia Italy

Department of Emergency Surgery City Hospital Mozyr Belarus

Department of Emergency Surgery Parma Maggiore Hospital Parma Italy

Department of General and Emergency Surgery ASST San Gerardo Hospital Monza Italy

Department of General and Thoracic Surgery University Hospital Giessen Giessen Germany

Department of General Surgery Division of Surgery Rambam Health Care Campus Haifa Israel

Department of General Surgery Faculty of Medicine Erzincan University Erzincan Turkey

Department of General Surgery Royal Perth Hospital The University of Western Australia Perth Australia

Department of General Surgery Trauma and Emergency Surgery Division ABC Medical School Santo André SP Brazil

Department of Surgery Anadolu Medical Center Kocaali Turkey

Department of Surgery Assia Medical Group Tel Aviv University Sackler School of Medicine Tel Aviv Israel

Department of Surgery College of Medicine and Health Sciences UAE University Al Ain United Arab Emirates

Department of Surgery Denver Health Medical Center University of Colorado Denver CO USA

Department of Surgery Division of Acute Care Surgery and Center for Sepsis and Critical Illness Research University of Florida College of Medicine Gainesville FL USA

Department of Surgery Emergency Hospital of Bucharest Bucharest Romania

Department of Surgery Hospital Universitário Terezinha de Jesus Faculdade de Ciências Médicas e da Saúde de Juiz de Fora Juiz de Fora Brazil

Department of Surgery Macerata Hospital Macerata Italy

Department of Surgery MOSC Medical College Kolenchery Cochin India

Department of Surgery Post Graduate Institute of Medical Sciences Rohtak India

Department of Surgery Radiology University Hospital of the West Indies Kingston Jamaica

Department of Surgery Royal Infirmary of Edinburgh Edinburgh UK

Department of Surgery School of Medicine Washington University Saint Louis USA

Department of Surgery The Brunei Cancer Centre Jerudong Park Brunei

Department of Surgery Tianjin Nankai Hospital Nankai Clinical School of Medicine Tianjin Medical University Tianjin China

Department of Surgery University Clinical Center of Tuzla Tuzla Bosnia and Herzegovina

Department of Surgery University Hospital Centre Zagreb Zagreb Croatia

Department of Surgery University of Washington Seattle WA USA

Department of Surgery Westchester Medical Center New York Medical College Valhalla NY USA

Division of Acute Care Surgery and Surgical Critical Care Department of Surgery Los Angeles County and University of Southern California Medical Center University of Southern California Los Angeles CA USA

Emergency Surgery Fondazione Policlinico Universitario A Gemelli IRCCS Università Cattolica del Sacro Cuore Rome Italy

Emergency Surgery Unit San Filippo Neri Hospital Rome Italy

Envision Healthcare Dallas TX USA

Gastroenterology and Endoscopy Unit University Hospital of Parma Parma Italy

General Acute Care Abdominal Wall Reconstruction and Trauma Surgery Foothills Medical Centre Calgary AB Canada

General Emergency and Trauma Surgery Department Pisa University Hospital Pisa Italy

General Surgery and Trauma Team University of Milano ASST Niguarda Milano Milan Italy

General Surgery Department Bufalini Hospital Hospital Cesena Italy

General Surgery Department Colorectal Surgery Unit La Paz University Hospital Madrid Spain

General Surgery Department Medical University University Hospital St George Plovdiv Bulgaria

General Surgery Versilia Hospital UslNordovest Tuscany Italy

Global Alliance for Infections in Surgery Porto Portugal

Infectious Diseases Unit Bolzano Central Hospital Bolzano Italy

Riverside University Health System Medical Center Loma Linda University School of Medicine Moreno Valley CA USA

School of Medicine and Surgery University of Milan Bicocca Milan Italy

Surgical Department and ICU Department General Hospital of Larissa Larissa Greece

Surgical Disciplines Immanuel Kant Baltic Federal University Regional Clinical Hospital Kaliningrad Russian Federation

Trauma Acute Care Surgery and Surgical Critical Care University of Campinas Campinas Brazil

Trauma Service Inkosi Albert Luthuli Central Hospital and Department of Surgery Nelson R Mandela School of Clinical Medicine Durban South Africa

Trauma Surgery Department Scripps Memorial Hospital La Jolla CA USA

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