Objective To investigate the diagnosis and treatment of primary gastrointestinal lymphomas(PGIL) Methods Forty-five cases of PGIL were retrospectively studied.Results The most common primary site of lymphomas was the stomach (32 cases),other sites included the small intestine(5 cases),the colon (5 cases)and the rectum(3 cases ).The mucosa-associated lymphoid tissue(MALT) lymphomas accounted for 40% of the total series.The depth of infiltration,lymph node lesion and MALT lymphomas involvement were correla...