The symptoms of gastric cancer are nonspecific and that is why most patients present themselves to the physician in advanced stages. Symptomatology in gastric cancer is similar to gasto-duodenal ulcer, and empirically most often leads to late diagnosis of gastric cancer. The authors present the case of a 74-year-old patient who was laparoscopically cholecystectomized 7 months ago, and a 4-month follow-up was performed in a classical urban hospital for gastric perforation with generalized peritonitis. Both interventions have omitted the patient's gaseous diagnosis - a small bending gas cancer. Subsequently, SCJU Sibiu was diagnosed with gastric cancer, cT3M1N0 and surgically intervened subtotal gastrectomy with restoration of the alimentary circuit by gastro-jejunal anastomosis on the anus in Y a to Roux. Favorable postoperative progression, patient discharged 5 days postoperatively. In our case, besides the empirical therapy for a suspicion of gastro-duodenal ulcer, we also encountered 2 intraoperative diagnostic errors, which led to the detection of gastric cancer in an advanced phase.