Abstract
We encountered a case of gastrointestinal malignant lymphoma with obstructive jaundice as an initial sign. At first, we diagnosed this case as a malignant lymphoma of duodenal papillary region. But at laparotomy, multiple malignant lymphomas were seen not only in the duodenum but also in the stomach, jejunum and ileum. By palliative operation, subjective symptoms were improved for a while. In spite of chemotherapy, multiple malignant lymphomas developed in oral cavity and subcutaneous tissue. This patient died about six months after the appearance of the initial symptom.