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Primary pulmonary synovial sarcoma is a very rare, but highly aggressive tumor. Metastatic pulmonary sarcoma due to hematogenous dissemination is much more common. Hence why in any case of pulmonary sarcoma, whole body survey is necessary to exclude a primary tumor elsewhere. No clinical or radiological presentations are specific for pulmonary sarcoma hence; it is often confused with bronchogenic carcinoma. On the other hand, image-guided fine needle aspiration cytology (FNAC) is very much helpful in diagnosis of bronchogenic carcinoma, whereas, it may be inclusive in cases pulmonary sarcomas including primary synovial sarcoma, especially in cases of huge pulmonary masses. So why image-guided tru-cut core biopsy or open lung biopsy and their histopathological examination, supplemented by immunohistochemistry are preferable for the tissue diagnosis of pulmonary synovial sarcoma, although FNAC and immunocytochemistry may be used for the diagnosis. Surgical resection is treatment of choice, if it is not possible, palliative chemotherapy may be an option. Here, we report a rare case of primary synovial sarcoma which occupied almost whole of the right hemithorax in a 60-year-old male farmer.