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Case Reports in Orthopedics
Volume 2016 (2016), Article ID 1214030, 4 pages
http://dx.doi.org/10.1155/2016/1214030
Case Report

Unusual Presentation of Popliteal Cyst on Magnetic Resonance Imaging

1Department of Orthopaedic Surgery, Enshu Hospital, Hamamatsu, Shizuoka 430-0929, Japan
2Joint Center, Jyuzen Memorial Hospital, Hamamatsu, Shizuoka 434-0042, Japan
3Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan

Received 13 June 2016; Accepted 17 November 2016

Academic Editor: Zbigniew Gugala

Copyright © 2016 Tsuyoshi Ohishi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Popliteal cyst commonly presents as an ellipsoid mass with uniform low signal intensity on T1-weighted magnetic resonance images and high signal intensity on T2-weighted images. Here, we describe a popliteal cyst with unusual appearance on magnetic resonance imaging, including heterogeneous intermediate signal intensity on T2-weighted images. Arthroscopic cyst decompression revealed that the cyst was filled with necrotic synovial villi, indicative of rheumatoid arthritis. Arthroscopic enlargement of unidirectional valvular slits with synovectomy was useful for the final diagnosis and treatment.