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Acinar cell carcinoma is an uncommon tumour, representing only 1% to 2% of all exocrine pancreatic tumours. Pancreatic-type acinar cell carcinoma can occur in other organs, including the stomach, but it is extraordinarily rare. We report a case of a 51-year-old woman with a pancreatic-type pure acinar carcinoma of the stomach coexisting with a large cell B lymphoma synchronously, and a literature review of gastric carcinomas with pancreatic cell differentiation. At present there is a preoperative underdiagnosis of these tumours that could be minimized by including this entity in the differential diagnosis of gastric cancer and by performing immunohistochemical analysis with neuroendocrine markers and exocrine pancreatic enzymes.

Peritoneal tuberculosis is a rare form of tuberculosis, which involves parietal and visceral peritoneum, omentum, and intestinal mesentery. Its incidence is increasing in developed countries due to HIV infection and immigration. We present a case of peritoneal tuberculosis in a twenty two-year-old patient misdiagnosed with appendicitis. A laparoscopic surgery was performed showing multiple implants on serosal surfaces and adhesions. Laparoscopic appendectomy and peritoneal biopsies were performed. As peritoneal tuberculosis was suspected, an early antituberculous treatment was initiated. A pathological examination of the samples revealed epithelioid granulomas with a centrale caseous necrosis and acid-fast bacilli. Peritoneal tuberculosis is a challenging diagnosis that can mimic other pathologies and should be kept in mind to establish an early antituberculosis treatment avoiding the high morbidity and mortality associated with a late treatment initiation. In case of suspicion of peritoneal tuberculosis, laparoscopy with guided biopsies is useful for the establishment of a correct diagnosis.

Todani proposed the most accepted classification for cystic lesions of the bile duct, including 5 types. Serena described another one, type VI, which includes cystic lesions of the isolated cystic duct, of which there are less than twenty reported cases. They differ from type II in terms of the distal cystic caliber, which is normal in type VI, and in the diagnosis which is performed intra-operatively in most of the cases. Neoplastic degeneration has an incidence of 10 to 30% in all these lesions, which is the reason why the most widely accepted treatment is cholecystectomy with resection of the cystic duct cyst dilatation and preservation of the main bile duct by a laparoscopic approach.