发生在某一脏器或组织的淋巴瘤称结外淋巴瘤(extra nodal lymphoma)或原发性淋巴瘤。胃肠道是原发性淋巴瘤最好发的部位(其次是皮肤、骨骼和上呼吸道)(1),原发性胃肠淋巴瘤在胃肠道的恶性病变中占据着一定的地位,例如原发性胃淋巴瘤约占胃部恶性肿瘤的5～11%(2),小肠淋巴瘤则占其恶性肿瘤的20%(3)。本病的临床表现缺乏特异性,容易误诊为癌肿,但其治疗和预后 Lymphomas that occur in certain organs or tissues are called extra nodal lymphomas or primary lymphomas. The gastrointestinal tract is the most prominent site of primary lymphoma (followed by the skin, bone and upper respiratory tract) (1). Primary gastrointestinal lymphoma occupies a certain position in the malignant lesions of the gastrointestinal tract, such as Primary gastric lymphoma accounts for 5 to 11% of gastric malignancy (2), and small intestinal lymphoma accounts for 20% of malignant tumors (3). The clinical manifestations of the disease lack specificity and are easily misdiagnosed as cancer, but its treatment and prognosis