BMC Pulmonary Medicine
Late pleural metastasis with immunophenotypic shift seven years after resection of shoulder synovial sarcoma: a case report
Abstract Background Synovial sarcoma is a soft tissue malignancy with a well-known propensity for late recurrence. Pleural metastasis occurring more than five years after primary resection in the absence of pulmonary involvement is exceptionally rare. Case presentation A 42-year-old man underwent local excision of a right shoulder synovial sarcoma in 2019 without adjuvant therapy or follow-up. In June 2026, he presented with right-sided chest pain and progressive dyspnea. Contrast-enhanced chest computed tomography …