19. USE OF FERROMAGNETIC SEED SIRIUS PINTUITION® ON THE LOCALIZATION OF NON-PALPABLE TUMORS: PILOT STUDY

Abstract

Abstract Introduction The ferromagnetic seed Sirius Pintuition® is a new technique for the localization of non-palpable tumors. It has several advantages compared to the wire: higher precision of the surgical incision and more comfort for the patient, given the possibility to implant it several days before the surgery. Methods To analyze the surgical results after excision of non-palpable breast tumors or axillary lymph nodes guided by ferromagnetic seed between December 2022 and April 2023. Results Forty-eight patients were included: 46 breast conservative surgeries and 2 axillary lymph nodes excisions, with women being the majority (46; 95,8%), with a median age of 63,5 (53,75-69). Most of them presented breast tumors (46): invasive ductal carcinoma (25;54,3%), followed by invasive lobulillar carcinoma (5;10,9%). Most frequent localization on the breast was upper external quadrant (19;41,3%), presenting mostly as nodule (35;72,9%) or microcalcifications (8;16,7%). The median size of the tumor was 14,50 mm (10-23). Most seeds were implanted guided by ultrasonography (44; 91,7%). One seed was implanted in 41 patients (85,4%) and 2 seeds in 7 (14,6%), with a median time to surgery of 3 days (1,25-6,75). During surgery a total 5 seeds were accidentally mobilized (10,4%). In 1 patient the resection margins were affected and in 14 the margin was less than 1 mm from the lesion. Eight patients needed re-resection of surgical margins. Conclusion The ferromagnetic seed Sirius Pintuition® demonstrated its efficacy in localizing and adequate resection of the lesions. Additionally, it allowed more logistic flexibility thanks to the possibility of implantation several days before surgery.