The paper presents a rare case of a patient with adenocarcinoma of the small intestine who reported to the hospital due to non-specific gastrointestinal symptoms. Following diagnostic examinations, the patient underwent a surgery. The post-operative period proceeded with no complications. The case presented below confirms the usefulness of imaging examinations (abdominal CT) when pathologies within the small intestine are suspected. An accurate interpretation of the result was an indication for a surgical intervention, but the final diagnosis is still established on the basis of the histopathological examination.