title: Giant cell tumor of the tendon sheath extending around the patellar tendon and invading the knee joint and tibia: A case report.
abstract: The current report presents the case of a 41-year-old male exhibiting a giant cell tumor of the tendon sheath (GCT-TS) arising from the patellar tendon sheath. Plain radiography and magnetic resonance imaging revealed a well-localized mass that wrapped around the patellar tendon, and extended from the subcutis into the infrapatellar fat pad and tibia. Following histopathological determination of the diagnosis, a piecemeal resection was performed. Nodular-type GCT-TS occurs less frequently in large joints compared with the small joints of the fingers and toes. The current report presents the unique features of a case of GCT-TS extending around the patellar tendon, and invading into the knee joint and proximal tibia bone.
authors.affiliation: Department of Orthopaedic Surgery, Shinshu Ueda Medical Center, Ueda, Nagano 386-8610, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Akahane
authors.affiliation: Department of Orthopaedic Surgery, Shinshu Ueda Medical Center, Ueda, Nagano 386-8610, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Mori
authors.affiliation: Department of Orthopaedic Surgery, Shinshu Ueda Medical Center, Ueda, Nagano 386-8610, Japan.
authors.forename: Kazushige
authors.initials: K
authors.lastname: Yoshida
keywords: giant cell tumor of the tendon sheath; knee joint; patellar tendon; tibia