title: Magnetic resonance imaging-based volumetric analysis and its relationship to actual breast weight.
abstract: BACKGROUND
  Preoperative volume assessment is useful in breast reconstruction. Magnetic resonance imaging (MRI) and mammography are commonly available to reconstructive surgeons in the care of a patient with breast cancer. This study aimed to verify the accuracy of breast volume measured by MRI, and to identify any factor affecting the relationship between measured breast volume and actual breast weight to derive a new model for accurate breast volume estimation.
  
  
  METHODS
  From January 2012 to January 2013, a retrospective review was performed on a total of 101 breasts from 99 patients who had undergone total mastectomy. The mastectomy specimen weight was obtained for each breast. Mammographic and MRI data were used to estimate the volume and density. A standard statistical analysis was performed.
  
  
  RESULTS
  The mean mastectomy specimen weight was 340.8 g (range, 95 to 795 g). The mean MRI-estimated volume was 322.2 mL(3). When divided into three groups by the "difference percentage value", the underestimated group showed a significantly higher fibroglandular volume, higher percent density, and included significantly more Breast Imaging, Reporting and Data System mammographic density grade 4 breasts than the other groups. We derived a new model considering both fibroglandular tissue volume and fat tissue volume for accurate breast volume estimation.
  
  
  CONCLUSIONS
  MRI-based breast volume assessment showed a significant correlation with actual breast weight; however, in the case of dense breasts, the reconstructive surgeon should note that the mastectomy specimen weight tends to overestimate the volume. We suggested a new model for accurate breast volume assessment considering fibroglandular and fat tissue volume.
authors.affiliation: Department of Plastic and Reconstructive Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Anna
authors.initials: A
authors.lastname: Yoo
authors.forename: Kyung Won
authors.initials: KW
authors.lastname: Minn
authors.forename: Ung Sik
authors.initials: US
authors.lastname: Jin
keywords: Dimensional measurement accuracy; Magnetic resonance imaging; Mammoplasty