Primary pulmonary lymphoma, which is constitutes only 0,5% of all lung tumors, is a rare tumor arising from intrapulmonary lymphatics. Due to presentation with mass and consolidation, many diseases, require to be considered in the differential diagnosis such as primary or metastatic lung cancer, pneumonia, pulmonary sequestration and atelectasis radiologically. A 44 years old male patient with complaints for two years, with 65x68 mm pulmonary mass lesion in left upper lobe and lingular segments which has boundaries could not be distinguished by heart border, was interned. Diagnostic thoracotomy applied and histopathology was obtained as pulmonary lymphoma. Wedge resection including lingula and lower lobe apical segments was performed. In this study, we aimed to present a case hospitalized with complaints of cough and fatigue and diagnosed as primary pulmonary ( low-grade B-cell) lymphoma
