Abstract: Objective:To investigate the CT manifestation of pulmonary mucosa-associated lymphoid tissue (MALT) lymphoma and improve the diagnostic level. Methods:The CT and clinical data of 7 cases of pulmonary MALT lymphomas proved by pathology were reviewed retrospectively. Results:There were 4 cases of multiple lesions and 3 cases of solitary lesion among 7 cases, 5 cases were pneumonic consolidation type and 2 cases were nodular/mass type. On unenhanced CT, all 5 cases of pneumonic consolidation type showed strip or patch consolidations of lung, and "air bronchograms sign" can be observed. Multiple ground glass nodules with clear margin were observed in 1 case; two cases of nodular/mass type showed intrapulmonary solitary mass with homogeneous density and clear boundary, and the maximum diameter was 32mm and 38mm respectively. "Air bronchograms sign" can be observed in 1 case. On enhanced CT, all 7 cases showed mild to moderate homogenous enhancement, and "blood vessel floating sign" can be observed in 5 cases. Multiple mediastinal lymphadenopathy can be observed in 1 case, a small amount of pleural effusion was observed in 2 cases and partial pleural thickening occurred in 2 cases. Conclusions:Most pulmonary MALT lymphomas manifested as multiple consolidation lesions. A few manifested as pulmonary nodule or mass, accompanied with "air bronchograms", "blood vessel floating sign" and mild to moderate enhancement. CT has important value for its diagnosis.