title: Protrusio acetabuli presenting as a complex pelvic mass after total hip arthroplasty.
abstract: BACKGROUND
  The differential diagnosis in an elderly woman with a complex pelvic mass includes benign and malignant diseases.
  
  
  METHODS
  A woman in her ninth decade was discovered to have both a breast mass and a pelvic mass at examination. After diagnostic breast biopsy results that confirmed invasive breast carcinoma, pelvic examination and ultrasonography were performed. The ultrasonogram demonstrated a large complex pelvic mass. The patient underwent an exploratory laparotomy at the time of her mastectomy. The pelvic mass was a protrusio acetabuli resulting from a prior right total hip arthroplasty.
  
  
  CONCLUSIONS
  A complex pelvic mass secondary to protrusio acetabuli is a rare clinical finding.
authors.affiliation: Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, University of Alabama at Birmingham, Birmingham, Alabama, USA. Trey_Leath@yahoo.com
authors.forename: Charles A
authors.initials: CA
authors.lastname: Leath
authors.forename: Mack N
authors.initials: MN
authors.lastname: Barnes
authors.forename: Warner K
authors.initials: WK
authors.lastname: Huh
mesh_terms: D000077:Acetabulum / Q000503:physiopathology*; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects* / Q000379:methods; D001707:Biopsy, Needle; D001943:Breast Neoplasms / Q000473:pathology* / Q000601:surgery; D003937:Diagnosis, Differential; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D007150:Immunohistochemistry; D007813:Laparotomy / Q000379:methods; D009361:Neoplasm Invasiveness / Q000473:pathology*; D015207:Osteoarthritis, Hip / Q000601:surgery; D010386:Pelvic Neoplasms / Q000175:diagnosis* / Q000556:secondary / Q000601:surgery; D017698:Postmenopause; D011475:Prosthesis Failure; D018570:Risk Assessment; D018608:Ultrasonography, Doppler