Breast Lesions with Discordant Results on Ultrasound-guided Core Needle Biopsy

ABSTRACT

PURPOSE: We wanted to evaluate the characteristics of those lesions showing insufficient results on ultrasound-guided core needle biopsy. MATERIALS AND METHODS: We retrospectively reviewed the pathologic results of 131 lesions from patients who underwent ultrasound-guided core needle biopsy following Mammotome or surgical excisional biopsy from January 2004 to December 2004. RESULTS: Compared with excisional biopsy, ultrasound-guided core needle biopsy showed 14 lesions with discordant results and 9 lesions with indeterminate results. 5 lesions were overestimated and 9 lesions were underestimated on the core needle biopsies. According to the histological tumor types, the papillary tumors showed 66.6% discordance or indetermination, and the phyllodes tumors showed 50% discordance or indetermination. CONCLUSION: On the results of core needle biopsy, discordant or indeterminate results were frequently reported for papillary and phyllodes tumor. Therefore, excisional biopsy is recommended for these types of tumor.