title: An atypically located large subchondral cyst in an osteoarthritic hip joint: a case report.
abstract: BACKGROUND
  Osteoarthritic subchondral cysts within or around the hip joint can sometimes be difficult to distinguish from primary osseous and soft tissue tumors due to their radiological appearance and uncommon location.
  
  
  METHODS
  We report the case of a 74-year-old Turkish man with a subchondral cyst arising from the hip joint, eroding the acetabulum and located on the medial side of the iliac bone, which imitated a soft tissue tumor. This cystic lesion was resected and the results of histopathological analysis of tissue samples were found to be consistent with an osteoarthritic cyst.
  
  
  CONCLUSIONS
  The present case illustrates how an osteoarthritic subchondral cyst can grow into the soft tissue planes in the presence of destruction of the articular cartilage and subchondral bone continuity, and present as an apparent soft tissue tumor.
authors.affiliation: Department of Orthopaedics and Traumatology, Yeditepe University School of Medicine, Istanbul, Turkey. maguven2000@gmail.com.
authors.forename: Melih
authors.initials: M
authors.lastname: Güven
authors.forename: Turhan
authors.initials: T
authors.lastname: Ozler
authors.forename: Onur
authors.initials: O
authors.lastname: Kocadal
authors.forename: Ferda
authors.initials: F
authors.lastname: Ozkan
authors.forename: Faik
authors.initials: F
authors.lastname: Altıntaş