12 The monophasic type is most common and made up of only of spindle cells. 11 There are three common histologic types. 10 Synovial sarcomas are high-grade (II/III). 6 Ninety percent of SS occur in the lower extremities often near joints, and in the trunk wall, but the disease can be found anywhere in the body 9 with rare reports of intra-articular SS. 5 Males and females seem to be equally affected. In one study, 84% of synovial sarcoma patients were between 10 and 50 years old. The aim of this article is to describe the key magnetic resonance imaging (MRI) features of SS, as well as to describe those of benign and malignant tumors that are often confused with SS (Table 1). Conversely, mistaking a benign lesion for an SS may result in increased patient anxiety and costs due to unnecessary procedures and imaging tests. Incorrectly assuming that an SS is a benign lesion will lead to delays in diagnosis and possibly prognosis. For these tumors to be biopsied, it is essential that interpreting radiologists or orthopedic oncologists not deem them benign. Since synovial sarcomas are so rare, many clinicians and radiologists are not familiar with their presentation and imaging appearance. 4 However, they are the second-most prevalent soft-tissue tumors after rhabdomyosar coma in children, adolescents, and young adults. 1-3 Synovial sarcomas are rare, with an estimated incidence of 2.75 in 100,000 people.
Synovial sarcomas (SS) are malignant soft tissue tumors thought to account for 5-10% of soft tissue sarcomas.
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