Introduction

Mustafa Alabussi is a Women's Imaging Fellow at the University of Toronto. Invasive laupular carcinoma or ILC is the second most common type of invasive breast cancer making up 15% of all cases. Fluorine 18 labeled fluoroastradiol or FES for short is a radiopharmaceutical for PET which is approved in the USA by the FDA in 2020 to use in patients with recurrent or metastatic breast cancer.