MR Imaging–guided 9-gauge Vacuum-assisted Core-Needle Breast Biopsy: Initial Experience

Purpose: To perform magnetic resonance (MR) imaging–compatible vacuum-assisted 9-gauge core-needle biopsy of suspicious enhancing breast lesions identified at MR imaging. Materials and Methods: The institutional review board granted exempt status for this HIPAA-compliant study and waived the requirement for informed consent. The MR imaging–guided 9-gauge vacuum-assisted core-needle biopsy findings of 85 lesions in 75 patients aged 31–89 years were retrospectively reviewed. The biopsies were performed as part of the patients' clinical care with a Food and Drug Administration–approved biopsy system and not within a research protocol. All included patients had received a diagnosis of malignant, benign, or high-risk (for cancer) breast tissue at core-needle biopsy and had undergone subsequent surgery or follow-up imaging. MR imaging–guided biopsy results were compared with final histopathologic or follow-up imaging findings. Results: At MR imaging–guided core-needle biopsy, malignancy was identified in 52 (61...