Objective   To analyze the features of CT images of secondary pulmonary lymphoma.    Methods   The dats of totally 20 patients with secondary pulmonary lymphoma which were proven through lung puncture pathology or clinical treatment were retrospectively analyzed. There were 19 non-Hodgkin lymphoma cases and 1 Hodgkin lymphoma case. All cases received thorax CT scanning

and 13 of them had enhanced CT scanning.    Results   There were many patterns in our CT findings for secondary pulmonary lymphoma

mixed pattern in 9 cases

mass (nodule) in 4 cases

pneumonic-alveolar in 3 cases

bronchovascular-lymphatic in 3 cases

and miliary in 1 case. There were 13 cases accompanying with mediastinal lymphadenovarix

5 cases with pleura invasion

11 cases with pleural effusion

and 2 cases with pericardium involvement. Mild enrichment was found in 7 cases and obviously enrichment was seen in 1 case.    Conclusion   Diversity is the characteristic feature of secondary pulmonary lymphoma. Combined with other thorax findings

CT scaning can make a definite diagnosis.