title: MRI follow-up after concordant, histologically benign diagnosis of breast lesions sampled by MRI-guided biopsy.
abstract: OBJECTIVE
  Follow-up MRI can be useful to confirm a benign diagnosis after MRI-guided breast biopsy. This retrospective study was undertaken to evaluate appropriate timing and imaging interpretation for the initial follow-up MRI when a benign, concordant histology is obtained using MRI-guided breast biopsy.
  
  
  METHODS
  Retrospective review was performed of 177 lesions visualized only by MRI in 172 women who underwent 9-gauge, vacuum-assisted core biopsy and marker placement with imaging-concordant benign histology. All underwent follow-up MRI within 12 months. Timing of the follow-up study, change in size, results of second biopsy if performed, and distance of localizing marker to the lesion on the follow-up study were recorded.
  
  
  RESULTS
  At initial follow-up, 155 lesions were decreased or gone, 14 lesions were stable, and eight were enlarged. Seventeen (9.6%, 17/177) lesions underwent a second biopsy, including six enlarging, 10 stable, and one decreasing. Of these, four were malignant. Enlargement was seen in two carcinomas at 6 and 12 months. Two carcinomas, one stable at 2 months and another stable at 3 and 11 months, were rebiopsied because of suspicion of a missed lesion in the former and worrisome mammographic and sonographic changes in the latter. The distance of the marker from the lesion on follow-up did not correlate with biopsy accuracy.
  
  
  CONCLUSIONS
  Follow-up MRI did not detect missed cancers because of lesion enlargement before 6 months after biopsy; two of four missed cancers were stable. The localizing marker can deploy away from the target despite successful sampling.
authors.affiliation: Department of Radiology, Breast Imaging Section, Memorial Sloan-Kettering Cancer Center, 1114 First Ave., Second Floor, New York, NY 10065, USA.
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: D David
authors.initials: DD
authors.lastname: Dershaw
authors.forename: Carol H
authors.initials: CH
authors.lastname: Lee
authors.forename: Jennifer
authors.initials: J
authors.lastname: Kaplan
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Morris
mesh_terms: D001706:Biopsy; D001941:Breast Diseases / Q000175:diagnosis* / Q000473:pathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D053783:Magnetic Resonance Imaging, Interventional; D008875:Middle Aged; D012189:Retrospective Studies; D013997:Time Factors; D014618:Vacuum