•Conservative breast surgery is the standard technique in breast cancer.•Multifocal breast cancer is a risk factor for involved margins.•Positive margins are considered one of the predictors for local recurrence.•Preoperative wire mapping after breast marking by the surgeon increase the chance to have negative margins.
Keywords: Conservative breast surgery; Multifocal breast cancer; Negative margins; Preoperative mapping; Ultrasound-guided wiring.
© 2020 The Author(s).