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Background: We present our experience with intra-abdominal malignancies different from gallbladder cancer not diagnosed preoperatively and undiscovered during laparoscopic cholecystectomyMethods: This study involved retrospective analysis of 10 patients hospitalized in the Second Department of General Surgery between 1993 and 2000. In all of them, laparoscopic cholecystectomy had been performed between one week and 21 months earlier.Results: Primary or metastatic neoplasms were diagnosed in five men and five women patients ages 38 to 79 years. In three patients with colorectal cancer, a radical resection was possible. Nonresectable pancreatic cancer was found in three patients. In one of two patients with gastric cancer, palliative, distal gastrectomy was performed. In a patient who had small bowel cancer with metastasis to the ovary, a radical operation was possible. In one patient, liver metastasis from lung cancer was found.Conclusions: In patients with atypical symptoms of gallbladder lithiasis, a thorough workup before laparoscopic cholecystectomy should be performed. During the laparoscopic procedure, a detailed examination of the whole peritoneal cavity is essential. In cases of prolonged convalescence after laparoscopic cholecystectomy, a source of symptoms different from cholelithiasis should be suspected. [ABSTRACT FROM AUTHOR]