Abstract: To study the radiological manifestations of primary pulmonary lymphoma and to improve the rate of successful diagnosis of primary pulmonary lymphoma. Methods: The clinical data, radiological manifestations and image features of 4 cases with primary lymphoma of the lung were retrospectively analyzed. Results: The manifestations of the 4 cases were as follows: one case had multiple nodules with consolidation of lung tissue and 3 cases had a solitary pulmonary mass, one of which showed no lobulation and 2 of which had shaggy margins with lobulation. Air- bronchogram and pleural effusion were seen in 2 of the cases. Conclusion: The radiological manifestations for primary lymphoma of the lung may be various and nonspecific. Among those various manifestations, a few features remain constant: solitary pulmonary mass is relatively common and pleura can be invaded. The final diagnosis of primary lymphoma of the lung depends on pathological examinations.