ShafaYahyaian Hopital, Iran University of Medical Sciences, Tehran, Iran
Periarticular cyst and cystic soft tissue lesion around the knee are common. Synovial sarcoma is a rare and malignant soft tissue tumor accounting for approximately 5% of soft tissue sarcoma. A case is presented where a lesion adjacent to the joint line of the knee was diagnosed clinically and on imaging as a meniscal cyst. MRI signal was homogenous and no concomitant meniscal tears were seen. The tissue diagnosis was monophasic synovial sarcoma.
Jones BC, Sundaram M, Kransdorf MJ: Synovial sarcoma: MR imaging findings in 34 patients. AJR Am J Roentgenol. 1993; 161(4):827-30.
Nakanishi H, Araki N, Sawai Y, Kudawara I, Mano M, Ishiguro S, et al. Cystic synovial sarcomas: imaging features with clinical and histopathologic correlation. Skeletal Radiol. 2003; 32(12):701–7.
Fisher C. Synovial sarcoma. Ann Diagn Pathol. 1998; 2(6):401-21.
Stein D, Cantlon M, Mackay B, Hoelscher C. Cysts about the knee: evaluation and management. J Am Acad Orthop Surg. 2013; 21(8):469-79.
Mills CA, Henderson IJ. Cysts of the medial meniscus. Arthroscopic diagnosis and management. J Bone Joint Surg Br. 1993; 75(2):293-8.
De Maeseneer M, Shahabpour M, Vanderdood K, Machiels F, De Ridder F, Osteaux M. MR imaging of meniscal cysts: Evaluation of location and extension using a three-layer approach. Eur J Radiol. 2001; 39(2):117-24.