Monophasic Primary Renal Synovial Sarcoma Accompanied With a Hemorrhagic Cyst

Corresponding Author: Teruo Inamoto, MD, PhD Department of Urology, Osaka Medical College, Takatsuki, Osaka 569-8686, Japan Tel: +81 726 831 221 Fax: +81726 846 546 E-mail: tinamoto@poh.osaka-med.ac.jp INTRODUCTION Synovial sarcoma is a soft tissue sarcoma with uncertain histogenesis, which is most prevalent in young adolescents. Primary synovial sarcoma rarely originates from the renal parenchyma. When this entity occurs, origin of this unusual tumor type has been the subject of discussion in the literature, with a suggestion that some previously reported cases might be more correctly described as renal cell carcinoma with sarcomatoid dedifferentiation. Renal synovial sarcoma (RSS) and sarcomatoid renal cell carcinoma may be hard to be distinguished only on histopathologic and immunohistochemical examination, but these tumors contain distinctly different sets of chromosomal abnormalities.(1)