title: Pathological femoral neck fracture caused by an echinococcus cyst of the vastus lateralis--case report.
abstract: BACKGROUND
  Musculoskeletal hydatid cysts are rare, but being locally invasive, can potentially cause significant deformity or pathological fracture.
  
  
  METHODS
  A 39 y.o. male presented to our orthopaedic outpatient clinic complaining of severe right hip pain, and inability to ambulate. Symptoms were not preceded by trauma. Subsequent imaging confirmed a large, 17 × 3 × 5 cm echinococcus cyst in the vastus lateralis, causing erosion of the proximal metaphysis of the femur. As a consequence the patient suffered a non-traumatic pathological intertrochanteric femur fracture. The patient was treated with an en-bloc excision of the lesion - the affected soft tissue envelope containing the large cyst - and as a second surgical step a cemented total hip replacement (THR) was implanted under the same anaesthetic. The manuscript reviews the literature regarding musculoskeletal hydatid disease.
authors.affiliation: 1Department of Traumatology, Békés County Hospital, 1 Semmelweis Street, Gyula, 5700, Hungary.
authors.forename: János
authors.initials: J
authors.lastname: Csotye
authors.forename: Krisztián
authors.initials: K
authors.lastname: Sisák
authors.forename: Loránt
authors.initials: L
authors.lastname: Bardócz
authors.forename: Kálmán
authors.initials: K
authors.lastname: Tóth
mesh_terms: D000328:Adult; D000818:Animals; D019644:Arthroplasty, Replacement, Hip / Q000706:statistics & numerical data; D004443:Echinococcosis / Q000150:complications* / Q000469:parasitology / Q000473:pathology / Q000601:surgery*; D004446:Echinococcus; D005265:Femoral Neck Fractures / Q000209:etiology / Q000469:parasitology / Q000601:surgery*; D005598:Fractures, Spontaneous / Q000209:etiology / Q000469:parasitology / Q000601:surgery*; D006620:Hip Fractures / Q000601:surgery; D006801:Humans; D008297:Male; D052097:Quadriceps Muscle / Q000469:parasitology / Q000473:pathology / Q000601:surgery*