The value of 6-month interval imaging after benign radiologic-pathologic concordant minimally invasive breast biopsy.

Background: Current National Comprehensive Cancer Network guidelines recommend repeat imaging 6-12 months after a benign radiologic-pathologic concordant image-guided breast biopsy. We hypothesized that interval imaging <12 months after benign concordant biopsy has a low cancer yield and increases health care costs.

Methods: An institutional review board-approved retrospective chart review identified 689 patients who underwent image-guided breast biopsy at Bryn Mawr Hospital between January and December 2010. Charts were evaluated for documentation of radiologic-pathologic concordance.

Results: Of 689 patients, 188 (27 %) had malignant pathology, 3 (0.4 %) had nonbreast pathology, and 498 (72.3 %) had benign pathology. Of 498 patients with benign findings, 44 (8.8 %) underwent surgical excision as a result of discordance, atypia, papillary lesion, or other benign finding. Of the remaining 454 patients who did not undergo excision, 337 (74.2 %) had documented radiologic-pathologic concordance. Interval imaging <12 months after benign biopsy was obtained in 182 (54.0 %) concordant patients. Five (2.7 %) patients had suspicious [American College of Radiology Breast Imaging-Reporting and Data System (BI-RADS) 4] findings on follow-up imaging. Only one breast cancer was identified, representing 0.5 % (95 % confidence interval 0-3.4) of all benign concordant patients undergoing interval imaging. The cost of detecting a missed cancer with interval imaging after benign concordant biopsy was $41,813.77 in this cohort.

Conclusions: Interval imaging performed <12 months after benign concordant breast biopsy demonstrated a low yield for the detection of breast cancer and resulted in increased health care costs. Our data support the policy for discontinuation of routine interval imaging after benign concordant biopsy.