title: Magnetic resonance-guided biopsies and localizations of the breast: initial experiences using an open breast coil and compatible intervention device.
abstract: OBJECTIVE
  The objective of this study was to evaluate the performance of a new commercially available open breast coil and compatible intervention device (Machnet) for magnetic resonance image (MRI)-guided breast interventions.
  
  
  METHODS
  Breast lesions detected on MRI were evaluated using MRI-guided core biopsy (n = 20) and/or preoperative wire localization (n = 23) on histologic outcome and accuracy of localization. Time needed to perform a procedure and occurring problems were recorded.
  
  
  RESULTS
  Mean lesion size was <10 mm. Two of 20 lesions could not be biopsied because they were out of range for the device. Biopsies were conclusive in half of the cases; most lesions missed were <10 mm. The average accuracy for needle placement in the localization procedures was less than 2 mm (range, 0-5 mm). The average procedure time was 40 minutes for a biopsy procedure and 33 minutes for an MRI-guided localization.
  
  
  CONCLUSIONS
  Preoperative MRI-guided localizations can be performed quickly and accurately. However, in MRI-guided core biopsies, especially in small lesions, the device does not guarantee conclusive histologic evaluation of the lesion targeted.
authors.affiliation: Department of Radiology, University Medical Center Nijmegen, The Netherlands. j.veltman@rad.umcn.nl
authors.forename: Jeroen
authors.initials: J
authors.lastname: Veltman
authors.forename: Carla
authors.initials: C
authors.lastname: Boetes
authors.forename: Theo
authors.initials: T
authors.lastname: Wobbes
authors.forename: Johan G
authors.initials: JG
authors.lastname: Blickman
authors.forename: Jelle O
authors.initials: JO
authors.lastname: Barentsz
mesh_terms: D001706:Biopsy / Q000295:instrumentation / Q000379:methods*; D001943:Breast Neoplasms / Q000473:pathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D009339:Needles