An unusual case of synovial sarcoma with breast metastasis: findings on positron emission tomography-computed tomography

Synovial sarcomas are aggressive soft-tissue tumors with the propensity for metastases at presentation or later course of disease. The most common site of metastases is lung, followed by lymph node and bone. It rarely metastasizes to the liver and to the brain. Breast metastases from extramammary tissue are extremely rare, more so from synovial sarcoma. ¹⁸F-fluorodeoxyglucose positron emission tomography-computed tomography (FDG PET/CT) plays a very important role in diagnosing occult metastasis in sarcomas. Histopathological diagnosis and translocation studies are important to confirm the diagnosis. We present a case of synovial sarcoma who underwent ¹⁸FDG PET/CT which showed occult metastasis to the breast. (author)