Objective: To determine the frequency of imaging-histologic discordance at percutaneous breast biopsy and to evaluate differences in clinical and radiologic findings between pathologically upgraded lesions and non-upgraded lesions.
Materials And Methods: From February 2000 to June 2005, we reviewed 386 cases that had suspicious imaging findings but yielded benign histology at US-core needle biopsy and that underwent subsequent excisional biopsy. In 74 of 386 cases, the benign histology at core needle biopsy could not provide a satisfactory explanation for the radiologically suspicious lesions.