title: Clip placement after an 11-gauge vacuum-assisted stereotactic breast biopsy: correlation between breast thickness and clip movement.
abstract: OBJECTIVE
  To retrospectively evaluate the accuracy of clip placement on the basis of measurements obtained on pre- and post-vacuum-assisted 11-gauge stereotactic biopsy mammograms and to analyze the factors that can predict which patients will experience a significant movement of the clip.
  
  
  METHODS
  The pre- and post-vacuum-assisted 11-guage stereotactic biopsy mammographic findings in 204 cases undergoing clip placement were reviewed. The clip-to-lesion distance was measured. The correlations between the clinical-mammographic findings and the likelihood of clip movement were evaluated.
  
  
  RESULTS
  Target mammographic lesion types of the 204 cases were characterized as calcification in all but one case, which was a distortion lesion. The clip-to-lesion distance was within 5 mm on both the craniocaudal and mediolateral oblique projections in 119 (58%) cases, within 6-10 mm in 28 (14%), within 11-19 mm in 25 (12%), and was > 20 mm in 32 (16%). The variability of the clip-to-lesion distance was greatest in the plane orthogonal to the compression plane used for stereotactic biopsy. Breast thickness was the only factor that was predictive of a significant movement of the clip, and thin breasts tended to exhibit greater clip movement.
  
  
  CONCLUSIONS
  Breast thickness may be a useful factor for predicting the degree of clip movement after 11-gauge vacuum-assisted stereotactic biopsy.
authors.affiliation: Breast Imaging and Breast Intervention Section in Breast Center and Department of Clinical Physiology, Shizuoka Cancer Center Hospital, Naga-izumi, Shizuoka, 411-8777, Japan, t.uematsu@scchr.jp.
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Uematsu
authors.forename: Masako
authors.initials: M
authors.lastname: Kasami
authors.forename: Kaoru
authors.initials: K
authors.lastname: Takahashi
authors.forename: Junichiro
authors.initials: J
authors.lastname: Watanabe
authors.forename: Seiji
authors.initials: S
authors.lastname: Yamasaki
authors.forename: Kumiko
authors.initials: K
authors.lastname: Tanaka
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Tadokoro
authors.forename: Akiko
authors.initials: A
authors.lastname: Ogiya
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001707:Biopsy, Needle / Q000295:instrumentation* / Q000379:methods*; D001943:Breast Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006801:Humans; D008327:Mammography; D008875:Middle Aged; D013238:Stereotaxic Techniques / Q000295:instrumentation; D013525:Surgical Instruments; D014618:Vacuum