SS is characterized by a specific chromosomal translocation between the SS18 gene on chromosome 18 and one of the several synovial sarcoma X genes on chromosome X.6,7 The majority of synovial sarcomas are slow-growing and the mean duration of symptoms before diagnosis is approximately 2 years.8 Similarly, in our case, the patient experienced painless swelling for approximately six years before the diagnosis of synovial sarcoma. The gene discussed is SS18; the disease is synovial sarcoma.