ABS ePoster Library

P037
Topic: Breast surgery

Introduction: Magseed is an alternative method of localising non palpable breast lesions that has addressed many of the limitations of wire guided localisation. It consists of a paramagnetic seed that can be visualised on mammography and ultrasound. Intraoperative localisation of the seed is achieved with the use of the Sentimag probe. The aim of this study was to prospectively compare localisation in patients undergoing wide local excision for non palpable lesions between Magseed and wire guided localisation. Methods : We prospectively collected data on all patients undergoing image guided wide local excision between October 2017 and September 2018 in two academic breast units with a planned accrual of 100 consecutive patients undergoing Magseed localisation. Data was also collected on a cohort of 100 consecutive patients undergoing wire guided localisation in the same time period. Results:Demographic and disease characteristics were well balanced between the two groups.Intraoperative identification and excision of the localised lesion was successful in all patients as confirmed with specimen radiography. Overall no significant differences were observed in the proportion of patients requiring re-excision between the two groups (Magseed 16% vs. WGL 14% p=0.692). Specimens size by weight were similar for both groups; the mean weight was 39.6 gr in the Magseed cohort and 44.5 gr in the wire localisation cohort (p=0.206). Conclusions:In our series Magseed localisation proved to be as reliable and effective as wire guided localisation in terms of lesion identification, excision with tumour free margins, re-operation rate and specimen weight.