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The foramen of Winslow constitutes the only natural communication between the greater and lesser sacs of the peritoneal cavity. The caudate lobe of the liver marks the superior boundary, and the 1st part of the duodenum forms the inferior border. The hepatoduodenal ligament, the free edge of the lesser omentum containing the hepatic portal vein, hepatic artery, and common bile duct, forms the anterior boundary. The inferior vena cava constitutes the posterior border.[1] Also referred to as the “epiploic foramen” or “omental foramen,” this structure was first described by Jacob Winslow in his 1732 publication, "Exposition anatomique de la structure du corps humain" (see Image. Foramen of Winslow).[2] Jacob Winslow, born in Denmark and later naturalized as a French citizen, converted to Catholicism. Winslow is regarded alongside William Cheselden in London and Alexander Monro in Edinburgh as a leading anatomist of the 18th century. His publication is notable for reliance solely on direct anatomical observation rather than the opinions of contemporaneous anatomists. Winslow subsequently held the position of professor of anatomy at the Jardin du Roi in Paris.[3][4] He also provided the first description of the foramen spinosum at the skull base. The foramen of Winslow carries clinical importance as a potential site of internal herniation and an access point for rapid hepatic inflow control. Mastery of the boundaries and adjacent structures of this foramen enables accurate identification during operative and diagnostic procedures. Familiarity with the anatomic relationships surrounding the region enhances surgical safety and improves recognition of pathology.