title: A case of intra-articular ganglion cysts of the knee joint: correlation between arthroscopic and magnetic resonance imaging.
abstract: Intra-articular ganglion cysts of the knee are rare. Here we report a case of an arthroscopically confirmed ganglion cyst arising from the posterior cruciate ligament (PCL) along with preoperative magnetic resonance imaging (MRI) findings.
  
  
  
  A 39-year-old female admitted a hospital with left knee pain with flexion and extension. MRI revealed a cystic lesion along the PCL. The lesion exhibited slight but homogeneous hyperintensity on T1 weighted images. Thin septals were visible within the lesion. Arthroscopic examination revealed a mass lesion with a white fibrous capsule, located near the PCL. A gel-like liquid spurted from the mass upon puncture. The lesion was completely resected. Histological examination revealed loose connective tissue and fibroblasts with collagen, thus confirming the diagnosis of a ganglion cyst.
  
  
  
  Many reports have suggested intra-articular ganglion cysts of the knee are rare. In our study, a cystic lesion may have been impinged between the PCL and intercondylar notch, resulting in flexion and extension difficulty in the left knee. Arthroscopic resection is the major treatment of intra-articular ganglion cyst, and preoperative MRI findings can predict the correct arthroscopic approach. We have reported a case in which an intra-articular ganglion attached to the PCL.
authors.affiliation: Department of Diagnostic Radiology and Nuclear Medicine, 3-39-22, Showa, Maebashi, Gunma, Japan.
authors.forename: Sayaka
authors.initials: S
authors.lastname: Kodaira
authors.affiliation: Department of Diagnostic Radiology and Nuclear Medicine, 3-39-22, Showa, Maebashi, Gunma, Japan. sojin@gunma-u.ac.jp.
authors.forename: Takahito
authors.initials: T
authors.lastname: Nakajima
authors.affiliation: Department of Diagnostic Radiology and Nuclear Medicine, 3-39-22, Showa, Maebashi, Gunma, Japan.
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Takahashi
authors.affiliation: Department of Diagnostic Radiology and Nuclear Medicine, 3-39-22, Showa, Maebashi, Gunma, Japan.
authors.forename: Shingo
authors.initials: S
authors.lastname: Moriya
authors.affiliation: Zenshukai Hospital, 1381, Ninomiya, Maebashi, Gunma, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Nakagawa
authors.affiliation: Department of Diagnostic Radiology and Nuclear Medicine, 3-39-22, Showa, Maebashi, Gunma, Japan.
authors.forename: Hidenori
authors.initials: H
authors.lastname: Ohtake
authors.affiliation: Department of Diagnostic Radiology and Nuclear Medicine, 3-39-22, Showa, Maebashi, Gunma, Japan.
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Tsushima
mesh_terms: D000328:Adult; D001182:Arthroscopy / Q000379:methods*; D005260:Female; D045888:Ganglion Cysts / Q000175:diagnosis* / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D064847:Multimodal Imaging; D016119:Posterior Cruciate Ligament / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D016896:Treatment Outcome
keywords: Arthroscopy; Ganglion; Intra-articular; MRI; knee