Lymphoproliferative diseases that affect the lung emerges in a broad clinical and pathologic spectrum. Although malignant lymphomas are usually seen primarily nodal origin, they can be seen in the extranodal localization. Lymphomas, starting in lungs primarily, are rare. Fifty three year-old female patient with ten-month persistent cough, sputum, complaints of shortness of breath was admitted to the clinic. Cystic lung diseases were thought in clinical and radiographic evaluations. Thoracotomy was performed. A cystic lesion was seen in the middle lobe. The lesion was sent for frozen section examination. Middle lobectomy was performed since frozen section examination was reported as malignancy for suspected material. Histopathological examination revealed the diagnoses of lymphoma. Clinical, radiological and histopathological diagnosis are difficult in Primary pulmonary lymphoma (PPL). Treatment is primarily surgical. In our study, it is highlighted that PPL is seen rarely and is similar to benign cystic lung disease and difficulties in diagnosis and treatment of PPL.