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Background: Although surgical excisional biopsy provides robust diagnostic results, the ultrasound-assisted vacuum-assisted biopsy (VABB) offers an alternative for Asian candidates with dense breasts and lesions which cannot be approached by stereotactic biopsy. The study aims to investigate the efficacy of the ultrasound-assisted VABB for impalpable mammographic-detected lesions. Materials and Methods: A retrospective case-control study is conducted in a group of Taiwanese female patients who have impalpable breast lesions such as microcalcifications at screening mammography that are limited to BI-RADS category 4. Specifically, the lesions are categorized into three groups: 4a, 4b, and 4c and the histology from B2 through B5. The cases underwent ultrasound-assisted VABB and the controls had lumpectomies. The diagnostic accuracy, rate of discordance, excited tumor size, and the proportion of cancer cases is evaluated and compared using Fisher's exact test, Cohen's kappa test, chi-Square test, and the use of IBM SPSS statistical programs. Results: The histology of the majorities of the collected specimen is B2 benign fibrocystic changes (60–70%). In cases of patients who are diagnosed with breast cancer, most are ductal carcinoma in situ and early-stage diseases. The cancer risks for lesions categorized under BI-RADS 4a, 4b, and 4c, respectively, are consistent with clinical practice. Meanwhile, the diagnostic accuracy of VABB is similar to lumpectomy, as the histologic discordance rate did not differ significantly. Conclusions: Ultrasound-assisted VABB does offer an option for patients who are not candidates for stereotactic biopsy, as it has shown to have noninferior diagnostic values and cosmetic benefits when compared to surgical excision. The use of sonography monitors the biopsy process and guides the needle insertion, which is thus capable of obtaining samples from multiple directions, without risking the pectoralis muscles underneath. However, VABB may be intended for biopsies in lower-risk findings such as BI-RADS category 4a because doubts persist as complete excisional rates are operator-dependent. [ABSTRACT FROM AUTHOR]

Wire localization of breast microcalcifications before surgical biopsy has been used for a long time. However, it causes patient's psychical trauma before operation with more cost of money and time as well. We design a noninvasive method using the concept of trigonometric function for preoperative localization. It can yield potential for cost-savings, increased efficacy in operating room and radiology scheduling, and patient comfort and convenience. Our method is simple and its failure rate is low.