Breast pseudoaneurysm arising from core needle biopsy should be left well alone.

A 45-year-old woman previously fit and well, developed a pseudoaneurysm of the breast following core needle biopsy. She was ultimately reassured and discharged without further intervention. Pseudoaneurysm is a rare complication of core needle biopsy which, contrary to previously published cases, can be managed conservatively. © BMJ Publishing Group Ltd (unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.