title: Baker's Cyst with Intramuscular Extension into Vastus Medialis Muscle.
abstract: Baker's cysts are one of the most common cystic lesions around the knee joint and mainly caused by fluid distension of the gastrocnemius-semimembranous bursa that is situated along the medial side of the popliteal fossa. Typically, a Baker's cyst extends along the intermuscular planes around the knee joint and may enlarge any direction. However, it is mostly located in the inferomedial or superficial layers of the knee joint and less commonly extends laterally or proximally. Expansion of the cyst tends to respect the intermuscular planes, and Baker's cysts along the intramuscular route have been rarely reported. Thus, we report a case of Baker's cyst with intramuscular extension into the vastus medialis muscle.
authors.affiliation: Department of Orthopaedic Surgery, Pusan National University School of Medicine, Busan, Korea.
authors.forename: Tae Wan
authors.initials: TW
authors.lastname: Kim
authors.forename: Jeung Tak
authors.initials: JT
authors.lastname: Suh
authors.forename: Seung Min
authors.initials: SM
authors.lastname: Son
authors.forename: Tae Yong
authors.initials: TY
authors.lastname: Moon
authors.forename: In Sook
authors.initials: IS
authors.lastname: Lee
authors.forename: Kyung Un
authors.initials: KU
authors.lastname: Choi
authors.forename: Jeung Il
authors.initials: JI
authors.lastname: Kim