We describe a case of a young woman with acute epigastric pain. Extensive diagnostic workup suggested a hernia through the foramen of Winslow. A laparoscopic exploration of the abdomen revealed an internal herniation of the cecum and ascending colon behind the hepatoduodenal ligament into the lesser sac. Successful management requires prompt diagnosis and surgical treatment. In our case the internal herniation was uncomplicated and could be reduced laparoscopically. To our knowledge, this is the first documented case of a laparoscopically treated Winslow hernia.