title: Retroperitoneal endometriosis causing unilateral hip pain.
abstract: BACKGROUND
  The usual symptoms of endometriosis are secondary dysmenorrhea, dyspareunia, and infertility, but when located in the retroperitoneal space, it might have atypical symptoms that delay diagnosis and postpone therapy.
  
  
  METHODS
  A young nulligravida presented with secondary dysmenorrhea and concurrent cyclic hip pain. Recent laparoscopy was reportedly normal. Computed tomography (CT)-directed percutaneous needle biopsy of a retroperitoneal mass showed endometriosis. Laparotomy with retroperitoneal dissection removed the endometriosis, and operative arthroscopy released strictured hip tendons improving her hip pain and limp.
  
  
  CONCLUSIONS
  Retroperitoneal endometriosis presenting as hip pain was diagnosed by CT-guided percutaneous needle biopsy permitting removal by a multidisciplinary surgical approach.
authors.affiliation: Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, Minnesota 55905, USA.
authors.forename: S
authors.initials: S
authors.lastname: Rana
authors.forename: R C
authors.initials: RC
authors.lastname: Stanhope
authors.forename: T
authors.initials: T
authors.lastname: Gaffey
authors.forename: B F
authors.initials: BF
authors.lastname: Morrey
authors.forename: D A
authors.initials: DA
authors.lastname: Dumesic
mesh_terms: D000328:Adult; D018771:Arthralgia / Q000209:etiology*; D004715:Endometriosis / Q000150:complications*; D005260:Female; D006621:Hip Joint; D006801:Humans; D012187:Retroperitoneal Space