Meckel’s diverticulum (MD) is the most common congenital anomaly of the gastrointestinal tract. Its prevalence in the general population is 0.9-3.0%. Among the malignant neoplasms of MD, carcinoids and gastrointestinal stromal tumors are predominant. Adenocarcinomas account for less than 6.0% of all associated malignancies. We present a rare clinical case of a 67-year-old patient with gastric-type adenocarcinoma in MD, with metastatic foci in both lobes of the liver at diagnosis. This case demonstrates the diagnostic and therapeutic procedures that led to correct diagnosis and satisfactory treatment outcomes. This case emphasized the importance of using all the possibilities in the diagnosis and treatment and the necessity of cooperation with other experts in properly managing this disease. We also expressed an opinion about considering prophylactic resection of an intraoperatively discovered MD.