Left side gallbladder is a rare anatomical anomaly reported in the literature. It is associated with various anatomical variations of the biliary way and intrahepatic portal supply. Most of the time, it is discovered as an incidental finding during intervention for cholecystectomy, exposing patients and surgeons to high risk of complication. To prevent this, we analyze the critical aspects that must be known to perform safe interventions either in the normal setting or in the emergency setting.

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... Different theories are proposed to describe this anomaly, but a debate is still open. Reviewing the literature and analyzing the different processes of formation, we create a classification that can explain how this anomaly can occur, dividing into four variation types.