Abstract: The imaging manifestations of pulmonary lymphoma are various, and it is necessary to make a comprehensive judgment based on the CT features, FDG concentration and other organ invasion conditions. The author selected two pathologically confirmed cases of pulmonary lymphoma, respectively primary pulmonary lymphoma and secondary pulmonary lymphoma, and analyzed their clinical features and ¹⁸F-FDG PET/CT imaging findings in detail. It is expected to provide clinical help.