A 54-year-old man was admitted to our clinic for a further examination of rectal and liver tumors, after which a rectal cancer, a hepatocellular carcinoma (HCC), a hemangioma of the liver a retroperitoneal cyst, and a submucosal tumor of the stomach (SMT) were diagnosed by means of a colonoscopy, a gastroscopy, and US, CT, and angiography, these tests also revealing elevated CEA and AFP levels. A hepatic subsegmentectomy and a Miles's operation, as well as an enucleation of other liver tumors and an SMT, were performed and a retroperitoneal cyst was removed. The histopathological finding of the rectal cancer was a moderately differentiated adenocarcinoma, while the liver tumors were determined as being an HCC of the trabecular type, adenomatas revealing hyperplasia, a hemangioma, and the SMT showing a benign leiomyoblastoma.