Abstract： To the Editor:Mucosa-associated lymphoid tissue (MALT) lymphoma arises at a wide range of different extranodal sides,including the stomach (70％),lung (14％),ocular adnexa (12％),thyroid (4％),and small intestine.[1,2] Most lung MALT lymphoma are marginal zone B-cell lymphoma with proliferation of small irregular monocytoid B cells around and between reactive lymphoid follicles,with extensive invasion of the lung parenchyma,forming lymphoepithelial lesions.Immunohistochemical analysis showed the positive staining for CD20 and Bcl-2 and negative staining for CD3,CD5,CD23,and CD10 in the neoplastic cells.