Pulmonary synovial sarcoma presenting as a pneumothorax during pregnancy

BACKGROUND: Synovial sarcoma is a clinically rare, but morphologically well-defined neoplasm, which accounts for approximately 10% of all malignant soft-tissue tumors. The diagnosis can be established with clinical and imaging evaluations together with immunohistochemical, electron microscopy, and molecular genetic studies. CASE: We describe a case of primary pulmonary synovial sarcoma presenting as a pneumothorax in a young woman at 34 weeks of gestation. Her persistent symptomatology ultimately led to a video-assisted thoracoscopy and thorascopic decortication. The diagnosis was established by pathology and immunohistochemistry of the cells, which were consistent with primary pulmonary synovial sarcoma.. CONCLUSION: Malignancies, even those as uncommon as primary synovial sarcoma, should be considered in the differential diagnosis of pneumothorax during pregnancy.