title: Breast biopsy: multicenter study of radiofrequency introducer with US-guided handheld system--initial experience.
abstract: OBJECTIVE
  To evaluate the utility of a radiofrequency (RF) introducer in placement and use of a handheld breast biopsy system during ultrasonography (US)-guided breast biopsy.
  
  
  METHODS
  In three institutions from September 2000 through June 2001, 99 patients were scheduled for US-guided breast biopsy with the handheld system. Patients were randomly assigned to undergo biopsy with the handheld system alone (control group, 50 patients) or with the RF introducer and the handheld system (treatment group, 49 patients). Investigators compared the ability of the radiologist and pathologist to obtain a histologic diagnosis, ease of tissue penetration, procedure time, and pain. Patients assessed their pain level after the procedure and at 1, 7, and 30 days after biopsy.
  
  
  RESULTS
  The RF introducer provided easier penetration (treatment group mean score, 1.6; control group, 2.4), particularly in patients with dense breasts (treatment group, 1.0; control group, 2.9) on the basis of a five-point scale (1 = very easy, 5 = extremely difficult). A histologic diagnosis was obtained in all cases, and no RF-induced artifact was reported. Average biopsy procedure time for treatment and control groups was not significantly different. Average patient pain levels were comparable between groups for each evaluation interval. Clinical complications in four treatment patients and three control patients were minor and resolved spontaneously.
  
  
  CONCLUSIONS
  The RF introducer may serve as a useful adjunct to the handheld biopsy system by facilitating penetration of breast tissue without causing any deleterious effects for the patient or the biopsy specimen.
authors.affiliation: Department of Radiology, Hôpital du Saint-Sacrement, Québec City, Canada. nduchesne@ottawahospital.on.ca
authors.forename: Nathalie
authors.initials: N
authors.lastname: Duchesne
authors.forename: Steve H
authors.initials: SH
authors.lastname: Parker
authors.forename: Anita J
authors.initials: AJ
authors.lastname: Klaus
authors.forename: Mary Lou
authors.initials: ML
authors.lastname: Mooney
mesh_terms: D000328:Adult; D000368:Aged; D001707:Biopsy, Needle / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods; D001940:Breast / Q000473:pathology*; D001943:Breast Neoplasms / Q000175:diagnosis; D004598:Electrosurgery / Q000009:adverse effects / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008875:Middle Aged; D010147:Pain Measurement; D018084:Ultrasonography, Interventional / Q000295:instrumentation