Vacuum Phenomenon in Parameniscal Cyst Masquerading as Infection – An Unusually Rare Presentation of a Common Entity

Abstract

Parameniscal cysts are a common entity in daily practice and are found in association with a meniscal tear. Vacuum phenomenon within joints and discs can be seen secondary to degeneration or application of traction, which is believed to be released from adjacent soft tissues. Although the vacuum phenomenon is frequently present within the joints, it is rare within a parameniscal cyst which resulted in a diagnostic dilemma. In this article, we present an unusual case with a combination of two rare entities, vacuum phenomenon within a large parameniscal cyst, which has not been reported so far along with management considerations.