Abstract: Objectives: To analyze the imaging features of primary pulmonary lymphoma and to differentiate it from other pulmonary tumors. Methods: CT imaging of patients proved by pathology as primary pulmonary lymphoma were analyzed retrospectively, and relevant literatures were reviewed. Results: Ten patients were enrolled in this study,7 patients were confirmed as mucosa-associated lymphoid tissue lymphoma (MALT),1 patient was diffuse large B cell lymphoma (DLBCL), and 2 patients were peripheral T-cell lymphoma. Air bronchogram could be seen in 8 patients. Vessel floating sign and mild enhancement could be seen in 9 patients.Halo sign could be seen in the edge of lesion in 8 patients. There were no special features in clinical manifestation. Conclusions: The imaging of primary lymphoma of lung is complicated and varied. There is no specific feature in both CT and clinical features. Air bronchogram, mild enhancement, vessel floating sign and halo sign could be the relatively specific sign of primary lymphoma in lung. The diagnosis of primary lymphoma in lung depends on pathological examination. For differential diagnosis, immunohistochemical staining and molecular pathological examination may be helpful.

Key words: Pulmonary lymphoma, Mucosa-associated lymphoid tissue lymphoma, Diffuse large B cell lymphoma, Peripheral T cell lymphoma