Fig. 5.

A 43-year-old man had a poorly differentiated synovial sarcoma in his right upper arm. A Magnetic resonance imaging (MRI) at his initial presentation. B MRI after four cycles of preoperative chemotherapy. There was marked cystic change in the tumor but no reduction in tumor size. C Fluorodeoxyglucose positron emission tomography (FDG-PET) at the initial presentation, showing abnormally hot uptake at the tumor. D FDG-PET after four cycles of preoperative chemotherapy showed disappearance of glucose uptake in the tumor. E Histology at biopsy (H&E). F Surgically resected specimen after preoperative chemotherapy, confirming the marked cystic change and only minimal residual viable tumor cells along the cyst wall (arrow)