Initial clinical experience with a new MRI vacuum-assisted breast biopsy device

Purpose: To report initial clinical experience with a new previously unreported vacuum-assisted device (EnCor MR, SenoRx, Aliso Viejo, CA) for magnetic resonance imaging (MRI)-guided breast biopsy and to compare this device with previously reported technologies. Materials and Methods: A prospective study of MRI-guided vacuum-assisted breast biopsies using the EnCor device was under-taken. Lesions targeted for biopsy were occult on mammography, ultrasound, and physical examination. Histologic results were obtained for all cases. Patients with benign, concordant results underwent clinical and imaging follow-up. Cases with discordant, high-risk, or malignant results were referred for surgical biopsy. Results: A total of 55 biopsies were performed in 47 patients. All biopsies were technically successful. Histologic results yielded malignancy in 10 (10/55, 18%) of the 55 lesions and high-risk or atypical lesions in 7 (7/55, 13%) of the cases. All of these patients have had surgical follow-up, with four (4/55, 7%) underestimations. There were three (3/55, 5%) discordant cases. 35 (35/55, 64%) lesions yielded benign concordant results. Of these, six (6/35, 17%) lesions were removed surgically, with confirmation of the MR-guided biopsy results. Twenty (20/35, 57%) lesions have undergone at least 6-month follow-up MRI, with resolution or stability of the MRI findings. Conclusion: The EnCor breast biopsy device has comparable results to those previously reported for other MRI-guided vacuum-assisted technologies.